List of JavaScript Kata to Update

This page lists JavaScript kata still stuck in Node 8.x. It's not grouped in any way at the moment.

Any help is appreciated, but I'm still looking for ways to automate common fixes. jscodeshift can be used to transform the code (see example). If you come up with a codemod, please create a similar demo on AST explorer and let me know on https://github.com/codewars/runner/issues/119. That issue also includes some background information.

Since Node 10.x, we've been using Mocha instead of the custom test framework. There are some required changes related to this.

• The test structure must be describe -> it -> assertions or it -> assertions (i.e., assertions must be inside it, and it cannot be nested). Grouping related tests with describe is preferred if there are many test cases. Note that tests with an invalid test structure might still look valid in the output panel. Automated updates have skipped over those with invalid structure.
• Test case callback passed to it is no longer immediately executed. This can be tricky to notice.
  • To avoid common issue with closure within a loop, all var within all tests have been upated to let when possible (if tests passed after the change).
• Test case defined with a callback. Some authors likes to write it("test", _ => {}) which creates a asynchronous test (it("test", (done) => { doStuff().on("end", done); })). Most of these have been fixed.
• Old assertions are still available in Node 10. It's also available in Node 12 with const Test = require("@codewars/test-compat");. Updating to Chai assertions can be done later with codemod, so it can be skipped.

Use the new "Fork" feature to update kata:

You don't need to open an issue/suggestion and wait to edit. Forking a kata in a language is similar to forking an approved translation, but better because

• all languages can be forked, including those added directly in Kata Editor and the original language
• it's never outdated because it forks from the kata

You should see "Fork" when viewing a kata with the language you've completed in selected. Click that to open a translation editor with the current version filled in. The proposed changes can be merged or rejected after publishing, just like translations.

Notes

Native BigInts in Node

Native BigInts are available in Node 10.x. JS versions of all BigInt katas (arithmetic operations to numbers represented as strings) should be removed once Node 8.x is deprecated in the future.

Though they should've been removed already anyway since bignumber.js is installed in the environment, which means require would have to be disabled. Which does nothing anyway because people can just copy the entire minified source code from the bignumber.js repo into their solution, and things go out of hand very quickly with this.

List of Node 12.x Kata

The following failed to upgrade to Node 14.x/18.x automatically.

1. Bresenham Circle Algorithm
2. Ludicrous Coloured Triangles

List of Node 10.x kata

The following failed to update automatically by prepending const Test = require('@codewars/test-compat'); to tests.

1. Brick by Boring Brick - Mathematical expression interpreter
2. Mad Mathematician's Calculator (Basic Version)
3. Mad Mathematician's Calculator (Hardcore Version)
4. one line task : date converter (not that date, the other one)

List of Node 8.x Kata

1. "AURUM RECLUDIT CUNCTA" - yet another FUBAR kata with restrictions which relies on specific setup of Node 8.
2. "console.log" and the Lexical "this"
3. "string".forEachMatch(regex, callback, [context]);
4. "TRaduttore".tr( [ "u", "tt" ] , "it" )
5. [AI] Play Me : CodeWarsRunner I (Introduction)
6. [AI] Play Me : CodeWarsRunner II (Acceleration)
7. [BF] Even or Odd?
8. [BF] Quine
9. #7 Matrices: Focused on the Contour
10. #8 Matrices: Up and Down Sorting For Each Column
11. 1 Two 3 Four 5!
12. 1st day of month that are Sunday in a year range
13. 2 DNAs sequences, coding for same protein?
14. 2048!
15. 5command - Esoteric programming #1
16. 5x5 Tap Code
17. 7-segment converter
18. 80's Kids #1: How Many Licks Does it Take?
19. 80's Kids #10: Captain Planet
20. 80's Kids #2: Help ALF Find His Spaceship
21. 80's Kids #3: Punky Brewster's Socks
22. 80's Kids #4: Legends of the Hidden Temple
23. 80's Kids #5: You Can't Do That on Television
24. 80's Kids #6: Rock 'Em, Sock 'Em Robots
25. 80's Kids #7: She's a Small Wonder
26. 80's Kids #8: The Secret World of Alex Mack
27. 80's Kids #9: Down in Fraggle Rock
28. 8kyu interpreters: HQ9+
29. A (no more) bugs trilogy: Episode 3 - Make a Player
30. A Banking Trouble
31. A bugs trilogy: Episode 1 - "Let Math.Random(); decide your future"
32. A Crazy Robot? Who's is behind the scenes to make that?
33. A for Apple
34. A functional deck of cards....
35. A kata is a kata, you can't say it's only a half!
36. A Man and his Umbrellas
37. A Memory game array
38. A Promise is a Promise
39. A simple Tic-tac-toe class
40. A Taste of Curry
41. Aaaaaand theeeeeen
42. ABC - Esoteric programming #2
43. Abstract Model Magic
44. Accumulator Calculator
45. ACME factory needs your help
46. Acute, Obtuse, or Right?
47. AD2070: Help Lorimar troubleshoot his robots- ultrasonic distance analysis
48. AD2070: Help Lorimar troubleshoot his robots-Search and Disable
49. Add Length
50. Add new item (collections are passed by reference)
51. Adding Arrays
52. Adding Big Numbers
53. Adding Binary Numbers
54. Additionless addition.
55. Additive Numbers
56. Advanced Events
57. After(?) Midnight
58. Age Range Compatibility Equation
59. Alex & snooker: points earned.
60. Alex & snooker: scores.
61. Alfred's Laundry Robot
62. Algebraic Lists
63. Aliens have landed
64. All Balanced Parentheses
65. All representations as binomial coefficient, or: How often in Pascal's Triangle ?
66. All Star Code Challenge #12
67. All Star Code Challenge #17
68. All Star Code Challenge #18
69. All Star Code Challenge #32
70. All that is open must be closed...
71. All unique
72. Alphabet symmetry
73. Alphabetic Anagrams
74. Alphabetical Sequence
75. Alphabetize a list by the nth character
76. Alphametics Solver
77. Alternate capitalization
78. Alternate Square Sum
79. altERnaTIng cAsE <=> ALTerNAtiNG CaSe
80. Alternating Loops
81. Alternative Truth Machine
82. Am I safe to drive?
83. Amidakuji
84. Amount to Coins - Universal
85. An 'orrible expression on 'is face
86. An Eventful Bus
87. Anagram difference
88. And the Mosckar goes to…
89. Angle-a-trons and Phyllotaxy
90. Angular modules
91. Anonymous Returns.
92. Answering questions about data with Lo-Dash - 1
93. Antipodal Points with Same Temperature
94. AOP - After
95. Apparently-Modifying Strings
96. Apply offset to subtitles
97. Approving Kata
98. Approximate Fractions
99. Are arrow functions odd?
100. Are the values equal?
101. Are there any arrows left?
102. Are they the "same"?
103. Are we alternate?
104. Are You a One-Liner? #1: divide 2,3,5,7
105. Are You a One-Liner? #2: multiplication table
106. Are You a One-Liner? #3: A4 Paper
107. Are you Geometric or Arithmetic? No, I´m both of them.
108. Area and perimeter of the ellipse
109. Area of a Circle
110. Area of a Square
111. Area of House from Path of Mouse
112. Area or Perimeter
113. Arguments to Binary addition
114. Array combinations
115. Array Deep Count
116. Array element parity
117. Array Graphics - Lines
118. Array Info
119. Array power
120. Array reduction
121. Array to HTML table
122. Array.prototype.push
123. Array.prototype.splice(from, count, insertItems...)
124. Array.prototype.splice(from, count, insertItems...) - Advanced
125. Arrays are Objects
126. Arrays of cats and dogs
127. Arrays of Lists of Sets
128. Article archive and social likes
129. Ascend, Descend, Repeat?
130. Ascii Art Generator
131. ASCII Games: Dance Dance Evolution I
132. ASCII Games: Flood Fill (Player)
133. ASCII Games: Warning: Ice!
134. ASCII hex converter
135. Assembler interpreter (part II)
136. Assorted Rectangular Pieces Puzzle
137. Atbash Cipher Helper
138. ATM Heist
139. Authenticate a list of usernames
140. Auto Sorted Array - Easy
141. Autocomplete! Yay!
142. Automaton (Part 2)
143. Automaton (Part 3)
144. Automorphic Number (Special Numbers Series #6)
145. Average Scores
146. Back to KinderGarten (eeeeeeasy)
147. Back to KinderGarten 3 : What's this list ? (easy?)
148. Back to KinderGarten II : Where's Aïcha ? (eeeasy)
149. Back to the Future?
150. Balance the arrays
151. Balance the parentheses
152. Balance the tree
153. Ball Launcher Robot
154. Ball Roll On Quartic Polynomial
155. Bar Graph - Graphing #1
156. Barbell racking calculator
157. Barbell weight
158. Base64 Encoding
159. Baseball
160. Basic Compression
161. Basic JS - Building a calculator
162. Basic markdown to HTML
163. Basic neural networks - Machine Learning #2
164. Basics - Generators #1
165. Basics 04: Rotate Matrix
166. Basket of Fruits
167. Batman Quotes
168. Bầu cua tôm cá
169. BBQ Pitmaster
170. Be Concise I - The Ternary Operator
171. Be Concise II - I Need Squares
172. Be Concise III - Sum Squares
173. Be Concise IV - Index of an element in an array
174. Beautiful STAR
175. BECOME IMMORTAL
176. Beeramid
177. Begin your day with a challenge, but an easy one.
178. Beginner Series #2 Clock
179. Behind Enemy Lines
180. Berlin Clock
181. Berserk rater: CG Vs. Clang
182. Bet payout calculator
183. Bicycle gear inch calculator
184. Big Arithmetic - integer add/subtract
185. Big Integer Modulo
186. Big integers sum
187. Big number problem
188. Bin to Decimal
189. Binary Genetic Algorithms
190. Binary scORe
191. Binary string
192. Binary Swap
193. Binary sXORe
194. Binary to string
195. Binary Zoo
196. Binding within the List Monad
197. BIO 2013 : Watching the Clock
198. bit "Wise" #1: XOR-cism
199. Bit calculator
200. Bit Plane Return
201. BitMath: Addition
202. BitMath: Multiplication
203. Bitty Words
204. Blobservation
205. Block-exchanging reverse
206. Bloxorz Solver
207. Boardgame Fight Resolve
208. Bob - The Automated Manager
209. Bob's Secret Cipher
210. Body mass index calculation
211. Boggle Word Checker
212. Boolean logic from scratch
213. Bouncing Ball
214. Bracket Duplicates
215. Brainscrambler - Esoteric programming #3
216. Branch Prediction
217. Breadcrumb Generator
218. Breadth-First DOM Traversal
219. Bribe the Guards of the Crown Jewels
220. Broken Image - Puzzles #1
221. Broken sequence
222. Build a pile of Cubes
223. Build a Trie
224. Building a mini search engine
225. Building a Sequence Cocatenating Digits with a Given Order.
226. Building blocks
227. Building Strings From a Hash
228. Bulk up!
229. Burrows-Wheeler transform I. Coding
230. Burrows-Wheeler transform II. Decoding
231. Buying a car
232. Buying the Farm : Irrigation
233. Caesar Cipher Encryption - Variation
234. Caesar Cipher Helper
235. Caffeine Script
236. Calculate age in years
237. Calculate Hypotenuse of Right-angled Triangle
238. Calculate mean and concatenate string
239. Calculate number of inversions in array in linearithmic time
240. Calculate Price Excluding VAT
241. Calculate the required interest rate
242. Calculate Two People's Individual Ages
243. Calculating Expected Utility
244. Calculating with Functions
245. Calculating with objects
246. Calculator (Addition and Spaces) [Part 1]
247. Calendar Week
248. Callback Set
249. Cambridge Word Scramble
250. CamelCase Method
251. Can I have cake?
252. Can you get the loop ?
253. Can you keep a secret?
254. Can you move to Zephland?
255. Can you test it for me?
256. Candy count
257. Candy problem
258. Capitalize first letter of a string
259. Capitals first!
260. Car Door Roulette - Harder Version
261. Card Counting
262. Card game
263. Card game: twenty-one
264. Cartesian coordinates from degree angle
265. Cartesian neighbors
266. Cartesian neighbors distance
267. Case Reversal of Consecutive Duplicates
268. Catch me if you can (rolling start)
269. Centroid I
270. Champernowne's Championship
271. Change it up
272. char_to_ascii
273. Character Concatenation
274. Character limits: How long is your piece of string?
275. Cheating a bit...
276. Check a Curious Divisibility. (Brute force version)
277. check for winning box in dots and boxes game
278. Check if a triangle is an equable triangle!
279. Check if number is prime without loops
280. Check if two words are isomorphic to each other
281. Check RNA Nucleotides
282. Check three and two
283. Check your arguments
284. Checkerboard King Combo Move
285. Chess piece values
286. Chessboard Squares Under Queen's Attack
287. Chicken Sexing
288. Chinese Zodiac
289. Chocolate Celebration
290. Chocolate Party
291. Choose featured projects for Gratipay's homepage!
292. Christmas baubles on the tree
293. Chuck Norris I - Push Ups
294. Chuck Norris II - One Punch
295. Chuck Norris VI - Shopping with Chuck
296. Chuck Norris VII - True or False? (Beginner)
297. Church numbers
298. Cipher
299. Circular Objects #1 - Running around in circles
300. Class conundrum - Bug Fixing #7
301. Classy Classes
302. Classy Extentions
303. Clay Pigeon Shooting
304. Clean up your Gibberish!
305. Clean your shoes rack
306. Climbing the Leaderboard
307. Clock Hands
308. Clock Patience
309. Closest and Smallest
310. Closest elevator
311. Closest friends
312. Closest to Zero
313. Clue - Esoteric programming #4
314. Code Adventurer Guild: BeiJing
315. Code Adventurer Guild: HongKong
316. Code-ilocks. This exercise is JUST RIGHT!
317. Codewars style ranking system
318. Coding 3min : A*B=C
319. Coding 3min : Are they symmetrical?
320. Coding 3min : Balance Attraction
321. Coding 3min : Count animals
322. Coding 3min : Eat watermelon
323. Coding 3min : Excel Puzzle #1
324. Coding 3min : Excel Puzzle #2
325. Coding 3min : Find the murderer
326. Coding 3min : Guess the Hat
327. Coding 3min : Hacker and change
328. Coding 3min : Half it II
329. Coding 3min : Half it III
330. Coding 3min : Half it IV
331. Coding 3min : Max Value
332. Coding 3min : Parallel circuit
333. Coding 3min : Planting Trees
334. Coding 3min : Reading a Book
335. Coding 3min : Remove screws I
336. Coding 3min : Remove screws II
337. Coding 3min : Series circuit
338. Coding 3min : Tidy up the room
339. Coding 3min : toLoverCase()
340. Coding 3min : Waiting for a Bus
341. Coding 3min: Bug in Apple
342. Coding 3min: Collatz Array(Split or merge)
343. Coding 3min: Father and Son
344. Coding 3min: Give me the equation
345. Coding 3min: Trypophobia
346. Coding Meetup #10 - Higher-Order Functions Series - Create usernames
347. Coding Meetup #15 - Higher-Order Functions Series - Find the odd names
348. Coding with Squared Strings
349. Collatz
350. Collision Detection
351. Color Ghost
352. Color of the moment
353. Colored Hexes!
354. Coloured Lattice Points Forming Coloured Triangles
355. Combine objects
356. Combining Records
357. Common array elements
358. Common Bit Twiddles
359. Compact data processing: bit comparison
360. Compare powers
361. Competitive eating scoreboard
362. Complete The Pattern #10 - Parallelogram
363. Complete The Pattern #11 - Plus
364. Complete The Pattern #12
365. Complete The Pattern #13
366. Complete The Pattern #14
367. Complete The Pattern #15
368. Complete The Pattern #16
369. Completed Mahjong Hands
370. Complex numbers
371. Composed Integers Having Prime Factors Only Once
372. Composing squared strings
373. Compound Nouns, Common Nouns, and Adjectives Test
374. CompoundArray
375. Compression : impossible
376. Computational Geometry 101: Perimeter and Area of an arbitrary shape (2D)
377. Compute a convex hull
378. Compute the Largest Sum of all Contiguous Subsequences
379. Compute Unix path
380. Concatenating functions
381. Concatenation substring
382. Conference Traveller
383. Config Parsing: INI
384. Configure an express server
385. Connect Four
386. Connect Four: Unlimited Edition
387. Connected blocks
388. Connected blocks (second part)
389. Consecutive Count
390. Consecutive k-Primes
391. Consecutive strings
392. Conservative Property Proxy
393. Consonant value
394. Constrained GCD
395. Contact Deduplication
396. Contamination #1 -String-
397. Control the Beast (controlled components in ReactJS)
398. Convert an array of strings to array of numbers
399. Convert Hash To An Array
400. Convert PascalCase string into snake_case
401. Convert Sentences to New York, my guy.
402. Convert the score
403. Converter
404. Converting integer to currency format
405. Conway's Game of Life - Unlimited Edition
406. Coordinates Validator
407. Coprimes up to N
408. Cost of Shopping
409. Count all the sheep on farm in the heights of New Zealand
410. Count chains of ones in subsequences
411. Count the Combinations
412. Count the connected components
413. Count the divisible numbers
414. Count the number of cubes with paint on
415. Count the Ones
416. Count the smiley faces!
417. Count The Zeros: 1 to n
418. Count word occurrences
419. Countdown - Longest Word
420. Countdown to Christmas
421. Counting DNA Nucleotides
422. Counting Duplicates
423. Counting E-Primes
424. Counting in English one, two, three... to 2 Quadrillion (2,000,000,000,000,000)
425. Counting Nested Functions
426. Counting Sort
427. Counting String Subsequences
428. Covfefe
429. Cracking CRC32
430. Crash Override
431. Crashing Boxes
432. Cream of the crop
433. Create 10x10 array and randomly fill each cell with "A", "B", "C", or "D"
434. Create a frame!
435. Create a House Cleaning Rota
436. Create a password hashing function.
437. Create Four Letter Birding Codes from Bird Names
438. Create palindrome
439. Create the base - Dungeon crawler #1
440. Create Your Own "Promise.all()"
441. Creating Elements with React
442. Credit Card Checker
443. Cross the Bridges
444. Crouching Distribution, Hidden Constant
445. Crushing blows and blushing crows
446. Cryptic Cave: Episode 1
447. Cryptography Challenge - Log of Lights
448. CSV representation of array
449. Currency Conversion
450. Currying functions: multiply all elements in an array
451. Custom Array Filters
452. Custom concat() Array Method
453. Custom each() Array method
454. Custom Setters and Getters
455. Cut array into smaller parts
456. Cut me in Pieces but in The Way I Like
457. D&D Character generator #1: attribute modifiers and spells
458. D&D Character generator #2: psion power points
459. D&D Character generator #3: carrying capacity
460. Dangerous Dates
461. Dashatize it
462. dataTypes String to Array
463. Date Format Validation
464. Date formatter
465. Date Sanity Methods
466. Dave's gamble.
467. Days in the year
468. Debug Sum of Digits of a Number
469. Decibel Scale
470. Decipher the Message
471. Decipher this!
472. Decode Morse
473. Decode the Morse code
474. Decode the Morse code, advanced
475. Decode the Morse code, for real
476. Decoded String by the Numbers
477. Decompose double strand DNA into 6 reading frames
478. Decreasing Inputs
479. Decrypt this school cipher
480. Deep Assignment
481. Deep Freeze
482. Defeat the Elemental Titans
483. Defend your castle
484. Deferred Objects
485. Déjà vu Duplicates
486. Delete occurrences of an element if it occurs more than n times
487. Deletion in an array
488. Delta Bits
489. Depot organization 1
490. Derive Cipher from Plaintext
491. Describe the shape
492. Design a simple markdown compiler with string substitution feature
493. Determine Results of Pole Vault Competition
494. Devil's Sequence
495. DevOps legacy roasting -> disco inferno -> burn baby burn
496. Diamonds and Toads
497. Dice roll - D&D #1
498. Dice Rolling
499. Did she say hallo?
500. Difference between two collections
501. Difference Of Squares
502. DigitAll
503. Digits Average
504. Disarium Number (Special Numbers Series #3)
505. Distance Between 2 Points on a Cartesian Plane
506. Distance from the average
507. Distribute server workload
508. Divide integers as strings
509. Divide numbers as strings
510. Divisible by previous digit?
511. Divisor harmony
512. DNA GC-content
513. Do something "n.times" (Simplifying "for" loops)
514. Do you speak "English"?
515. Do you speak retsec?
516. Dollars and Cents
517. Dominant array elements
518. Dominant primes
519. Domino Tiling - 2 x N Board
520. Domino Tiling - 3 x N Board
521. Domino Tiling - 5 x 2N Board
522. Domino Tiling - M x N Board with Holes
523. Don't Drink the Water
524. Don't get stressed
525. Don't rely on luck HARDCORE
526. Dont drive too long!
527. Doomsday Basic
528. DOS era #1: Help!!!
529. DOS era #2: Attrib
530. Dota 2 Bots - Pudge's Meat Hook
531. Double Rainbow!
532. Double Trouble
533. Down Arrow With Numbers
534. Draw a Circle.
535. Dream Or Reality
536. Dreidel dreidel
537. Driving Licence
538. Driving School Series #2
539. Drunk friend
540. Drying Potatoes
541. Duck Duck Goose
542. Dude E Free
543. Dumb News: The Truth About CW Leaderboard !
544. Dummy Epoch - find the gap
545. Duplicate Arguments
546. Duplicates. Duplicates Everywhere.
547. Easy Cyclist's Training
548. Easy Diagonal
549. Easy Line
550. Easy mathematical callback
551. Easy Time Convert
552. Echo
553. Elections: Weighted Average
554. Element equals its index
555. Elevator algorithm
556. Elevator Distance
557. Elevator with call buttons
558. Ellipse contains point?
559. Elo rating - one game, one pair
560. Email Validation
561. Emily's Eccentric Encoding
562. Emirps
563. English beggars
564. Enumerable Magic - Does My List Include This?
565. Enumerable Magic #1 - True for All?
566. Enumerable Magic #4 - True for None?
567. Enumerable Magic #5- True for Just One?
568. Equation Discovery
569. Equivalent Dice
570. Error Throwing - Error Handling #2
571. ES2015: Get the real length of string. 
572. ES6 string addition
573. Escape the maze
574. Esolang Interpreters #1 - Introduction to Esolangs and My First Interpreter (MiniStringFuck)
575. Especially Joyful Numbers
576. esrever esreveR!
577. Euclidean distance in n dimensions
578. Evaluate a postfix expression
579. Even Binary Sorting
580. Even numbers in an array
581. Even odd disparity
582. Even Odd Pattern #1
583. Every archer has its arrows
584. Every possible sum of two digits
585. Everything Is Even
586. Evil Autocorrect Prank
587. Excel sheet column numbers
588. Exclamation marks series #4: Remove all exclamation marks from sentence but ensure a exclamation mark at the end of string
589. Exclusive "or" (xor) Logical Operator
590. Exclusive presentations
591. Expression Transpiler
592. Expressive Objects
593. Extended weekends
594. Extended Weekends - Challenge Edition
595. Extending JavaScript Objects: Contains Method
596. Extending JavaScript Objects: Get First & Last Array Element
597. Extending JavaScript Objects: Reverse String
598. Extending JavaScript Objects: Simple Math Methods
599. Extra Perfect Numbers (Special Numbers Series #7)
600. extract file name
601. Extract the IDs from the data set
602. Fabergé Easter Eggs crush test
603. Fac Recursion (Pest control - find the bugs and fix them)
604. Factorial
605. Factorial length
606. Factory Functions #1 - Creating profile for people
607. Factory Functions #2 - Inheritance and Object Composition
608. Failed Filter - Bug Fixing #3
609. Failed Sort - Bug Fixing #4
610. Fake website #1: Choose a good name for the website
611. Fake website #2: Choose a best server to create website
612. Fake website #3: Choose a cool color for the web site
613. Fake website #4: Design a strict user registration verification function
614. Fake website #6: Design an automatic beta katas processing function
615. Fame Of All
616. Fast/Precise Natural Logarithm
617. Fastest Code : A*B=C
618. Fastest Code : Count animals
619. Fastest Code : Equal to 24
620. Fastest Code : Excel Puzzle #2
621. Fastest Code : Half it III
622. Fastest Code : Half it IV
623. Faulty Data Recovery
624. Feed Kahumolings!
625. Feynman's square question
626. Fibo akin
627. Fibonacci Generator
628. Fibonacci, Tribonacci and friends
629. Fifa 17 Launch
630. Figure Out the Notes
631. File Finder
632. File Size Trouble!
633. Fill in the gaps in my timesheet.
634. Filling an array (part 1)
635. Filling an array (part 2)
636. Filter out for good!
637. Filter valid romans
638. Financing Plan on Planet XY140Z-n
639. Find Cracker.
640. Find a Bunch of Common Elements of Two Lists in a Certain Range
641. Find a Very Special Set Of Numbers In a Certain Range
642. Find All Array Values That Fall Within a Given Difference
643. Find all non-consecutive numbers
644. Find all occurrences of an element in an array
645. Find an area
646. Find array
647. Find Factors Down to Limit
648. Find Fibonacci last digit
649. Find Grid Position
650. Find heavy ball - level: conqueror
651. Find heavy ball - level: master
652. Find heavy ball - level: novice
653. Find heavy ball - level: ubermaster
654. Find last Fibonacci digit [hardcore version]
655. Find me the names
656. Find min and max
657. Find Multiples of a Number
658. Find Nearest square number
659. Find number in an array # 2
660. Find number in an array # 3
661. Find number in an array # 4
662. Find number in an array # 5
663. Find number in an array # 6
664. Find Number With Maximum Number Of Divisors
665. Find Numbers with Same Amount of Divisors
666. Find out the longest string chain
667. Find out whether the shape is a cube
668. Find sum of top-left to bottom-right diagonals
669. Find the area of the rectangle!
670. Find the calculation type
671. Find the Capitals
672. Find the discounted prices
673. Find The Duplicated Number in a Consecutive Unsorted List - Tougher Version
674. Find the force of gravity between two objects
675. Find the Golden Ticket!
676. Find the hobbits!
677. Find the Integral
678. Find the Location for the Wildlife Study
679. Find the longest gap!
680. Find The Max Sum Of Contiguous-Submatrix In a Matrix - Ultimate Version
681. Find the Middle of the Product
682. Find the Mine!
683. Find the missing element between two arrays
684. Find the missing term in a Geometric Progression
685. Find the missing term in an Arithmetic Progression
686. Find the Most Probable Sum Value or Values, in Rolling N-dice of n Sides
687. Find the motif in DNA sequence.
688. Find the Nexus of the Codewars Universe
689. Find the Nth longest string in an Array
690. Find the odd int
691. Find The Parity Outlier redux
692. Find the position!
693. Find the smallest
694. Find the sum of the roots of a quadratic equation
695. Find the Word Pair!
696. Find Transcription Factors
697. Find whether there is a route between two nodes in a graph
698. Find within array
699. Find X
700. Finding North
701. Finding Remainder Without Using '%' Operator
702. Finding the Closest Maximum Values of a Function to an Upper Limit
703. Finish this Mini Sudoku
704. First n Prime Numbers
705. First-Class Function Factory
706. Fix arithmetic progression
707. Fix array sequence
708. Fix string case
709. Fix your code before the garden dies!
710. Fixed length palindromes
711. FIXME: Get Full Name
712. Fizz Buzz - Without ifs
713. Fizz Buzz Reloaded
714. FizzBuzz Backwards
715. Flexible Card Game
716. Flight incident probabilities
717. Floating-point Approximation (II)
718. FloatStream
719. Fly as fast as you can
720. Follow that Spy
721. Following Sierpinski's Footprints
722. Following the Paths of Numbers Through Prime Factorization
723. Food combinations
724. For the sake of argument
725. For Twins: 1. Types
726. For UFC Fans (Total Beginners): Conor McGregor vs George Saint Pierre
727. Format data value
728. Format Text
729. Forming a Magic Square
730. Four Pass Transport
731. Foxes and rabbits
732. Free pizza
733. Frequency Analysis With Buckets
734. Freudian translator
735. Friday the 13th Part 1
736. Frugal Pizza
737. Fruit Machine
738. Fruit string calculator
739. Fuel economy converter (mpg <-> L/100 km)
740. Fuel usage reporting
741. Fun with ES6 Classes #1 - People, people, people
742. Fun with ES6 Classes #2 - Animals and Inheritance
743. Fun with ES6 Classes #3 - Cuboids, Cubes and Getters
744. Fun with ES6 Classes #4 - Cubes and Setters
745. Function Cache
746. Function Wrappers: Inline Testing
747. Function Wrappers: pool
748. Function.prototype.clone
749. Functional Addition
750. Functional Binary Trees
751. Functional Lists
752. Functions of Integers on Cartesian Plane
753. functions waterfall!
754. Funny jubilees
755. Future
756. Game Hit the target - 2nd part
757. Gaussian primes
758. Generate a random number (the hard way!)
759. Generate An Array of Unique Strings
760. Generate range of integers
761. Generate user links
762. Generating Generators - Generators #3
763. Generic Ball Clock
764. Genetic Algorithm Series - #1 Generate
765. Genetic Algorithm Series - #3 Crossover
766. Geohashing
767. Geometric Mean I
768. Geometric Progression Sequence
769. Geometry Basics: Circle Area in 2D
770. Geometry Basics: Distance between circles in 2D
771. Geometry Basics: Distance between points in 3D
772. Geometry Basics: Triangle Area in 2D
773. Geometry Basics: Triangle Perimeter in 2D
774. Gerrymander Solver
775. Get all array elements except those with specified indexes
776. Get angle between hour and minute hands
777. Get array elements with specified keys
778. get ascii value of character
779. get character from ASCII Value
780. Get Password from grid
781. Get root property name
782. Get Smallest Common Factor
783. Get the Excel column title!
784. Get the Grid Coordinates
785. Get your steppin' on son
786. Get Zodiac Sign
787. Getting along with Bernoulli's numbers
788. Give me a Diamond
789. Give me DST !!!
790. Give me the k first digits. Odd digits.
791. Global estimates
792. Goldbach’s Conjecture
793. Gotta start somewhere - Code Tracker #1
794. GPS Navigation
795. Grandpa's pants
796. Graphics Series #1: barcode EAN-13 part1
797. Graphics Series #2: barcode EAN-13 part2
798. Graphics Series #3: Repair the LED display
799. Graphics Series #4: Fireworks
800. Graphics Series #5: The rope is burning
801. Graphics Series #6: Traffic lights check
802. Grasshopper - Function syntax debugging
803. Grasshopper - Object syntax debug
804. Grasshopper - Terminal Game #1
805. Greatest Common Factor of an Array
806. Greatest Difference
807. Green Glass Roof- Puzzles #6
808. Grocer Grouping
809. Group Repeating Fractions
810. Gryffindor vs Slytherin Quidditch Game
811. Guess the array
812. Guess the list pattern #2
813. Guess the number!
814. Hack My Account!
815. Hacker's job
816. Haiku Wizard
817. Half Life
818. Hall Of Fame
819. Hamming(7,4) code - Message encoding
820. Hamster me
821. Handy Toolbox for Kata authors
822. Hangman
823. Hangman game
824. Hangŭl Unicode From Jamo Values
825. Hannah vs. Snooze Button
826. Happy New Year, 2018 !!
827. Happy numbers
828. Happy numbers to the n power
829. Hard Time Bomb
830. Harry and the Mathematician's Chicken
831. Haskell scanl function
832. heggeleggleggo
833. Hello Happy Codevarrior!
834. Help Mrs Jefferson
835. Help Green Lantern with his web site
836. Help Kiyo きよ solve her problems LCM Fun!
837. Help Mr. E
838. Help Mr... Dr. Strange to bargain!
839. Help Suzuki pack his coal basket!
840. Help Suzuki purchase his Tofu!
841. Help the general decode secret enemy messages.
842. Help your fellow warrior!
843. Help Yumi collect all the rings. Part 1
844. Heroes of Might & Magic II: One-on-One
845. Heroes of Might & Magic II: Chain Lightning
846. Hex class
847. Hex to base64
848. Hex Word Sum
849. hidden key
850. Hide from the Sun
851. Hide password from jdbc url
852. Hide phone numbers
853. Highest number with two prime factors
854. Hit Count
855. Hofstadter Q
856. Hold'em Holecard Combinatorics
857. Holiday IV - Leg Room
858. Holiday VI - Shark Pontoon
859. Holiday X - Bintang Vests
860. Hollow Triangle
861. Homogenous arrays
862. Horror Top Trumps (card game)
863. House of cards
864. How deep do these trees even go?
865. How far can you pedal a bike???
866. How Green Is My Valley?
867. How long should you cook this for?
868. How long will it take the train to reach its final destination?
869. How low do you go?
870. How many consecutive numbers are needed?
871. How many cows do you have?
872. How Many Differences of Squares?
873. How many dots are covered
874. How many eggs?
875. How many feelings?
876. How many numbers III?
877. How Many Numbers?
878. How Many Numbers? II
879. How many palindromes can you find ? (performance)
880. How many times should I go?
881. How much coffee do you need?
882. How much Wood?
883. How old will I be in 2099?
884. HTML DOM: Part 1 - Tree
885. HTML DOM: Part 2 - Attributes
886. Human Friendly Random Numbers
887. Human readable duration format
888. Human readable working hours
889. Hungarian Vowel Harmony (harder)
890. I guess this is a 6kyu kata #10: Emotion of sentences
891. I guess this is a 6kyu kata #2: Merge strings
892. I guess this is a 6kyu kata #3: Trim the Christmas tree
893. I guess this is a 6kyu kata #5: Whac-A-Mole
894. I guess this is a 7kyu kata #1: Search result
895. I guess this is a 7kyu kata #4: Find 0 and 1
896. I guess this is a 7kyu kata #6: Fruit Ninja I
897. I love big nums and I cannot lie
898. I need a lookup quick!
899. I need more speed!
900. I Promise Not To Optimize
901. I Spy
902. I'm already Tracer
903. I'm longer than you!
904. Ideal electron distribution
905. Identify the array's ordering
906. Image Files Only
907. Image Processing
908. Imaginary Base Conversion
909. Imperfect Fibonacci Rabbits
910. Imperfect Network #1 (duplicate messages)
911. Imperfect Network #2 (out-of-order messages)
912. Implement "The Match" to assign med school graduates to hospitals
913. Implement brute force protection
914. Implement Debounce
915. Implementing a Queue
916. Implementing a Queue - Performance Version
917. Implied Probability from Fractional Betting Odds
918. Indexed capitalization
919. Infinite Diceworks: MeanMaxing your rolls
920. Infinite Diceworks: MeanMaxing your rolls (Quantum Mechanically)
921. Infinite Sequences
922. Ins and Outs--Play game Series #6:
923. Insane Permutation Promenade (from AoC 2017 Day 16)
924. Insert Dashes 2
925. Insert into xml object - xml #3
926. Insert value into an array
927. Inserting multiple strings into another string
928. Inspiring Strings
929. Instant Runoff Voting
930. Integer depth
931. Integer reduction
932. Integer to Musical Pitch Classes
933. Integer triangles
934. Integer Triangles Having One Angle The Double of Another One
935. Integer with the longest Collatz sequence
936. Integers Sum Square
937. Interactive Dictionary
938. Interesting Pyramid
939. Interlaced Spiral Cipher
940. Invalid Input - Error Handling #1
941. IP Validation
942. IPv6 address validation and contraction
943. IPv6 validator
944. Is a Prime?
945. Is Divisible By 6 Mk II
946. Is Integer Array?
947. Is It In?
948. Is n divisible by (...)?
949. Is there a sequence re-occuring in the list
950. Is there an arrow missing ? (Relations - Part1: Reflexivity)
951. Is this working?
952. Is Undefined?
953. Is your period late?
954. isAN(value)
955. isInt32(int, byteLength)
956. ISRC - Significant Figures
957. isReallyNaN
958. It's Full of Stars
959. Iterative Rotation Cipher
960. Japanese Romaji-to-Hiragana Converter
961. Java format Unicode encoder/decoder
962. JavaScript class-like objects
963. Javascript filter - 1
964. Javascript filter - 2
965. Javascript filter - 3
966. Javascript from the Inside #1 : Map
967. Javascript from the Inside #2: Filter
968. Javascript Mathematician
969. JavaScript seems to be broken
970. Jewel Thief
971. John and Ann sign up for Codewars
972. Join command (simplified)
973. Jokes you've been 'awaiting' for ... promise
974. Josephus Permutation
975. Josephus Survivor
976. JS Golfing #1: undefined
977. JS Golfing #2: Math.floor
978. JS Golfing #3: Math.round
979. JS Golfing #4: Math.random
980. JS Golfing #5: A Million Times
981. JS Golfing #6: String Summation
982. JS Golfing #7: Join
983. JS Golfing #8: Is it Uppercase?
984. JSON Account Updater
985. JSON Parser
986. Jumble words
987. Jump!
988. Jumping Kangaroos
989. Jumping Number (Special Numbers Series #4)
990. Jurassic Word
991. Just Adding and Multiplying
992. Kama Sutra Cipher Helper
993. Kaprekar Split
994. Kaprekar's Routine
995. Karnaugh's detonating timer (a k-map primer)
996. Kata Impossible I - The Impossible Lottery
997. Kebabize
998. Keypad horror
999. Keys, their drawings and ancient symbols
1000. Keyword Cipher Helper
1001. Kids and candies
1002. KISS - Keep It Simple Stupid
1003. Knapsack Part 1 - The Greedy Solution
1004. Kushim the Accountant: Extract $ values from text
1005. L1: Bartender, drinks!
1006. Large Factorials
1007. Larger Product or Sum
1008. Largest Cross Sum
1009. Largest Elements
1010. Largest Palindromic Product
1011. Largest product in a series
1012. Last
1013. Last and rich in circle
1014. Last Digit of an Array
1015. Last digit of a huge number
1016. Last digit symmetry
1017. Lat/Long Parser
1018. Laxative Shot Roulette
1019. Lazy Chain
1020. Lazy evaluation
1021. Left$ and Right$
1022. Let's Play Darts!
1023. Lexicographic Permutations
1024. Life without primes
1025. Limit string length - 1
1026. Line Segments Intersection Point
1027. Line, Normalization
1028. Linear Equation Solver
1029. Linear Regression of Y on X
1030. Link Up--Play game Series #7
1031. Linux history and ! command. Series#1 The !! command
1032. Linux history and ! command. Series#2 The !n command
1033. Linux history and ! command. Series#3 The !-n command
1034. Linux history and ! command. Series#4 The !string command
1035. Linux history and ! command. Series#5 The !?string command
1036. List Comprehensions
1037. Lists and Objects - Top Trump Optimizer
1038. Live and Let Dice ...roll
1039. Live Chess Ratings
1040. Localize The Barycenter of a Triangle
1041. Logic Calculator - Puzzles #3
1042. Logical Disjunctions
1043. Logistic Map
1044. Long Division
1045. Longest Consecutive Sequence of Squares
1046. Longest palindrome
1047. Longest Word in Dictionary
1048. Loose Change
1049. Loose Change!
1050. Lost number in number sequence
1051. Lottery machine
1052. Lowercase strings in array
1053. Lowest product of 4 consecutive numbers
1054. LRU Cache
1055. Lucas numbers
1056. Lucas-Lehmer Test for Mersenne Primes
1057. Lucky Sevens
1058. Lychrel numbers
1059. LZW Compression - Squeeze that data!
1060. LZW Compression (and decompression)
1061. Mad Max: Recursion Road
1062. Madhav array
1063. Magic Square Validator
1064. Magic The Gathering #2: Mana
1065. Magic The Gathering #3: Spell Stack
1066. Mahjong - #2 Seven-pairs
1067. Mahjong - #3 How far from winning
1068. Mahjong - #4 Play with imagination!
1069. Mahjong winning hand Validation #1: DA SI XI(大四喜)
1070. Mahjong winning hand Validation #2: DA SAN YUAN(大三元)
1071. Mahjong winning hand Validation #4: JIU LIAN BAO DENG(九莲宝灯)
1072. Mahjong winning hand Validation #5: YI SE SI BU GAO(一色四步高)
1073. Make a 1 to n sequence
1074. Make a Palindrome
1075. Make a square box!
1076. Make Object Into Iterable Array
1077. Make the Deadfish Swim
1078. Make the small words big!
1079. Making Change
1080. Making Change: Part 2
1081. Making Copies
1082. Making squares with lines
1083. Man in the west
1084. Manage the Robot Factory: Day 1
1085. Manipulate URL Parameters
1086. Many Maps As One
1087. Map and Filter to Get a Special Sequence of Integers
1088. Map function issue
1089. Marching armies
1090. Markings to White Triangles and How to Find Them
1091. Masquerade Waiting Line
1092. Master your primes: sieve with memoization
1093. Math Issues
1094. Math Object Madness
1095. Matrix Multiplier
1096. Matrix Rotation
1097. Matrix Square Up, B!
1098. Max number of people and year in a specific place
1099. Max-min arrays
1100. Maxed Out
1101. Maximum Product of Parts
1102. Maximum Product
1103. Maya Number Converter
1104. Memesorting
1105. Memoized Log Cutting
1106. Memory Reallocation
1107. Merge two arrays
1108. MergeSort "merge" function
1109. Message from Aliens
1110. Meta-Kata: Duplicate Detector v0.1
1111. Metaprogramming: Lisp-style Generic Functions
1112. Mid-Endian numbers
1113. Midpoint inception
1114. Midtown Navigator
1115. Miles per gallon to kilometers per liter
1116. Milliseconds
1117. Min or Max of . . .
1118. Mind the Gap
1119. Mine Sweeper
1120. Minimum dollar bill's count
1121. Minimum Number of Coins
1122. Minimum path in squares
1123. Minimum Reduction
1124. Minimum Steps (Array Series #6)
1125. Miracle Sort
1126. Missing Alphabet
1127. Missing Angle
1128. Missing number in Unordered Arithmetic Progression
1129. Mission: Hidden Message
1130. Mixbonacci
1131. mkdir -p - starting from NodeJS 10, fs.mkdirSync has recusrive option, which defeats the purpose of this kata. Either restrict the usage of such option or rertire the kata as obsolete.
1132. Mnemo Passwords : pwgen
1133. Mnemonic Lookup
1134. Modulo operations of big Numbers
1135. Monads: The Maybe Monad
1136. Monads: The list monad
1137. Money Match: Double or Nothing
1138. Mongodb ObjectID
1139. Monkey Talk
1140. Monkey Tennis - The Aftermath
1141. Monkey's MATH 01: How many "ZERO"s?
1142. MONTE CARLO 3D
1143. month name story
1144. Months, Weeks, Days, Hours and Minutes
1145. Most Consecutive Zeros of a Binary Number
1146. Most frequently used words in a text
1147. Mount Events in ReactJS
1148. Moves in squared strings (I)
1149. Moves in squared strings (II)
1150. Moves in squared strings (III)
1151. Moves in squared strings (IV)
1152. MTV Cribs
1153. Multi Line Task: Fizz Buzz
1154. Multi Line Task: GCD Function
1155. Multi Line Task++: Hello World
1156. Multi Line Task∞: Hello World
1157. Multiple implications
1158. Multiple remainder of the division
1159. Multiples by permutations
1160. Multiples By Permutations II
1161. Multiples of 3 and 5 redux
1162. Multiplication - Generators #2
1163. Multiplicative Persistence... What's special about 277777788888899?
1164. Multiply list by integer (with restrictions)
1165. Multiply the number
1166. Multiply Word in String
1167. multiply(value, times)
1168. Mutate My Strings
1169. Mutual Recursion
1170. myjinxin katas #001 : Rotate, Remove, Return
1171. myjinxin katas #002 : Hotel room number
1172. myjinxin katas #003 : Crossword puzzle
1173. myjinxin katas #004 : Soldier's queue training(easy version)
1174. myjinxin katas #005 : Age Of Wind
1175. myjinxin's Fairy tales #001 : Aladdin's lamp and three wishes
1176. myjinxin's Fairy tales #002 : Ali Baba and the Forty Thieves I
1177. myjinxin's Fairy tales #003 : Ali Baba and the Forty Thieves II
1178. myjinxin's Fairy tales #004 : Ali Baba and the Forty Thieves III
1179. myjinxin's Fairy tales #005 : The little match girl
1180. Mystery Function
1181. Mystery function #1
1182. Mystery function #2
1183. N High Scores
1184. N smallest elements in original order
1185. n-Bonacci Ratio
1186. N-centered Array
1187. N-Parasitic Numbers Ending in N
1188. N00bify - English to n00b Translator
1189. Name Array Capping
1190. Name on billboard
1191. Name That Integer
1192. Name to Matrix
1193. Natas Recipes
1194. NATO Phonetic Alphabet
1195. Natural Log Approximator
1196. Naughty or Nice?
1197. Needles in a haystack
1198. Negation of a Value
1199. Nesting Structure Comparison
1200. new Deck() of Cards
1201. new IntStorage(byteLength, ints).read(from, count);
1202. new IntStorage(byteLength).write(value, length)
1203. new with apply
1204. Next Featured Number Higher than a Given Value
1205. Next Largest Value (by rearranging the last digit and the last by one if neccessary)
1206. Next Palindromic Number.
1207. Next smaller number with the same digits
1208. Nickname Generator
1209. NIM the game
1210. Ninety Nine Thousand Nine Hundred Ninety Nine
1211. Ninja vs Samurai: Strike
1212. No Loops 1 - Small enough?
1213. No Loops 2 - You only need one
1214. No Return #2: Test the Devices
1215. No Return #3: Solve the Equation
1216. Node.js Async I/O
1217. Non Decomposable Primes as Sums of Perfect Squares
1218. Non-even substrings
1219. None shall pass
1220. noobCode 03: CHECK THESE LETTERS... see if letters in "String 2" are present in "String 1"
1221. noobCode 04: HOT SINGLES...compare two arrays, return the unpaired items !
1222. Normal number
1223. Normalizing Out of Range Array Indexes
1224. Not all but sometimes all
1225. Not prime numbers
1226. Not Quine
1227. Not so black box
1228. Not that obvious summation
1229. Not very secure
1230. Now that's a crib!
1231. Noye's Fludde
1232. NSA Phone Tapping
1233. NSA's Little Puzzle
1234. nth Floyd line
1235. Nth Smallest Element (Array Series #4)
1236. Nth term - Linear Sequences
1237. Nuclear Missile Manager
1238. Number , number ... wait LETTER !
1239. Number climber
1240. Number Decoding
1241. Number Manipulation I (Easy)
1242. Number of anagrams in an array of words
1243. Number of Folds
1244. Number of measurements to spot the counterfeit coin
1245. Number of Palindromic Substrings
1246. Number of Proper Fractions with Denominator d
1247. Number Shortening Filter
1248. number with 3 roots.
1249. Number-like counter
1250. Number-Star ladder
1251. Number.prototype.toDecimal
1252. Numbers and its Reversal Having Same Prime Factors.
1253. Numbers in different systems
1254. Numbers in strings
1255. Numbers that are a power of their sum of digits
1256. Numbers Which Sum of Powers of Its Digits Is The Same Number
1257. Numbers' Plus Pattern
1258. Numerical Palindrome #2
1259. Numerical Palindrome #3
1260. Numerical Palindrome #3.5
1261. Numerical Palindrome #4
1262. Numerology
1263. NxN Connect X
1264. Obfuscation confusion - Bug Fixing #10
1265. Object to Array
1266. object to xml - xml #2
1267. Objectify all the strings
1268. Odd Not Prime
1269. Odd-heavy Array
1270. Odds-Index
1271. Offload your work!
1272. Offspring Traits
1273. Oh come on! Hello world! once again?
1274. Oh dear God! Is it bugged?
1275. Oktober Fest: Bjorg's Got A Drinking Problem
1276. Old Greg's Binary Fingers
1277. Once
1278. One down
1279. One graph or multiple ones ?
1280. One Line : Bit Calculator
1281. One line kata: Sum Multiples of 3 and 5
1282. One Line Task: 'for' fun
1283. One Line Task: Diamond Creator Pro
1284. One Line Task: Making Pizza
1285. One line task: Multiples of 3 and 5
1286. One Line Task: Paint The Walls Of Office
1287. One line task: Square a number Without *, + or Math.pow()
1288. One line task: Square Every Digit
1289. One Line Task: String Isomorphism
1290. One Line Task: The Special Downward Step
1291. One Line Wonder: Sum All Even Fibonacci Numbers
1292. One Line: Even Check
1293. One Variable Second Degree Equation Solver
1294. Ones' Complement
1295. Onion array
1296. Ookkk, Ok, O? Ook, Ok, Ooo!
1297. Operation - Steal the Election!
1298. Optimum coding school location
1299. Oracle: Coin Method
1300. Ordinal Numbers
1301. Ore Numbers
1302. Organise duplicate numbers in list
1303. ORing arrays
1304. Orthogonal Vectors
1305. Pack the box.
1306. PaginationHelper
1307. Palindrome for your Dome
1308. Palindrome integer composition
1309. Palindromes with a slight twist: vowels & consonants assessed separately
1310. Palindromic Mnemonics
1311. Paragraph Setting: Align Left
1312. Parallel resistors
1313. Parity bit - Error detecting code
1314. Parse a linked list from a string
1315. Parse all my XML please - Angular #1
1316. Parse HTML/CSS Colors
1317. Parse this function! - Puzzles #7
1318. Parsing musical notes into MIDI
1319. Partial Word Searching
1320. Partially equal objects
1321. Partition On
1322. Path Finder #2: shortest path
1323. Path Finder #3: the Alpinist
1324. Path Finder #4: where are you?
1325. Path Finder #5: there's someone here
1326. Paths in the Grid
1327. Paul Cipher & Kevin Arnold
1328. PC upgrade specs using HOC in ReactJS
1329. Peak array index
1330. Peel the Pairs
1331. Pentabonacci
1332. Percentage of amino acids
1333. Perfect Square.
1334. Permutation position
1335. Permutation Average
1336. Permutation by number
1337. Permutational Primes
1338. Permutations - Generators #4
1339. Permutations Of An Array And Associated Values
1340. Permute a Palindrome
1341. Personalising Spammy Marketing Emails
1342. Personalized brand list
1343. Physics - Mechanics - Atwood Machines in Series
1344. Piano Kata, Part 1
1345. Piano Kata, Part 2
1346. pick a set of first elements
1347. Pig Sursurunga
1348. Pillow on the Fridge
1349. Ping-Pong service problem
1350. Pinocchio's polygraph.
1351. Pitches and Notes
1352. Pizza Payments
1353. Plants and Zombies
1354. Play FlappyBird : Advance Bravely
1355. Play PacMan : Devour all
1356. Play PingPong : Precise control
1357. Play Tetris : Shape anastomosis
1358. Player Contact Manager
1359. Player Methods - Dungeon crawler #2
1360. Playing with Sets : Complement
1361. Playing with Sets : Equal or Not ?
1362. Playing with Sets : Intersection
1363. Playing with Sets : Sup/Sub
1364. Playing with types
1365. Plenty of Fish in the Pond
1366. Plus - minus - plus - plus - ... - Count
1367. Plus - minus - plus - plus - ... - Sum
1368. Podcast Speed Listening Calculator
1369. Pokemon Go
1370. Pokemon Go - Extended Edition
1371. PokerHelper lvl. 1
1372. Pole Vault Starting Marks
1373. Polish alphabet
1374. Polygon Orientation
1375. Poor man's spreadsheet API
1376. Portion of Array
1377. Possibilities of throwing a coin n times
1378. Possible Triangles Formed with Available Iron Rods
1379. Potenciation
1380. Potion Class 101
1381. Power
1382. Power .bind()
1383. Power 2
1384. Power Laws
1385. Powers of 3
1386. Powers of i
1387. Practical Interview Prep: Binary Search Tree .push()
1388. Pre-FizzBuzz Workout #1
1389. Prefix Permutation
1390. Presentation order
1391. Preserve the order !
1392. Pretty date
1393. Price is right
1394. Price of Mangoes
1395. Prime reduction
1396. Prime reversion
1397. Prime Word
1398. Primes in numbers
1399. Primitive Pythagorean Triples
1400. Primorial Of a Number
1401. Print a Rectangle Using Asterisks
1402. Print count and numbers
1403. Print number with character
1404. PRNG: Linear Congruential Generator
1405. Process Waterfowl Survey Data Results
1406. Product ID from URL
1407. Product of Adjacent Grid Numbers
1408. Product of consecutive Fib numbers
1409. Product Of Maximums Of Array (Array Series #2)
1410. Product of the main diagonal of a square matrix.
1411. Product-Sum Numbers
1412. Program a Calculator #1 - Points in 3D Space
1413. Program a Calculator #2 - 3D Vectors
1414. Progressive Spiral Number Branch
1415. Progressive Spiral Number Distance
1416. Progressive Spiral Number Position
1417. Promises Made and Broken: The Misadventures of Bob the Highly Paid Consultant
1418. Protein Synthesis: From DNA to Polypeptide
1419. Puzzle Fighter
1420. Pythagorean Triplets
1421. PythonSlice
1422. Quadratic Enumerator
1423. Quantum Bogosort
1424. Quartile methods
1425. Queue Battle
1426. Queue time counter
1427. Quick (n choose k) calculator
1428. Quicksum
1429. Quidditch Scoreboard
1430. Quipu Calculator
1431. Random case
1432. Randomize Objects
1433. Range function
1434. Range of Integers in an Unsorted String
1435. Ranking Appointments
1436. Ranking System
1437. Rap-Name Generator
1438. Ratio of Bouncy Numbers
1439. Reach Me and Sum my Digits
1440. React Fun #1: Component types and nesting
1441. React with JSX
1442. Read the time
1443. Readability is King
1444. Readable developer-friendly large numbers
1445. Really Complex Sum
1446. Recurrence by Recursion
1447. Recursion 101
1448. Recursion #1 - Factorial
1449. Recursion #2 - Fibonacci
1450. Recursion: An introduction
1451. Recursive Averages
1452. Recursive Floor Sequence
1453. Recursive Ninja
1454. Recursive Ninja: Warlords edition
1455. Reducing Problems - Bug Fixing #8
1456. Refactored Greeting
1457. Regular Expression for Binary Numbers Divisible by n
1458. Reimplement Multiplication Part 1
1459. Relatively Prime Numbers
1460. Remember
1461. Remove a Specific Element of an Array
1462. Remove All The Marked Elements of a List
1463. Remove duplication
1464. Remove First and Last Character Part Two
1465. Remove Zeros
1466. ReOrdering
1467. Replace Noun Phrases with Pronouns
1468. Represent array of numbers as ranges
1469. Retrieve Ether Balance
1470. Return a sorted list of objects
1471. Return Specifics from an Object.
1472. Return String of First Characters
1473. Return the first M multiples of N
1474. Return TIMESTAMP from date
1475. Reverse a Number
1476. Reverse DNS delegation (RFC4183)
1477. Reverse every other word in the string
1478. Reversed Message
1479. reverseIt
1480. Reverser
1481. Reversi row rudiments
1482. Rithm Series: Frame a Phrase Simple
1483. Roasting Chicken
1484. Robbing Rövarspråket
1485. RoboScript #5 - The Final Obstacle (Implement RSU)
1486. Robotic Tattoo Removal
1487. Rock Paper Scissors Oracle
1488. Roman numerals converter and validator
1489. Romanize Russian Road Signs
1490. ROT13 variant cipher
1491. Rotate Array (JS)
1492. Rotate Corners
1493. Rotate matrix counter - clockwise N - times!
1494. Rotated string
1495. Rotation Cipher Cracker
1496. Round by 0.5 steps
1497. Round to nearest 0 or 5
1498. Route Calculator
1499. Routes in a square grid
1500. Running out of space
1501. RuplesJS #1: N Times Do
1502. RuplesJS #2: String Delete
1503. RuplesJS #3: String EachChar
1504. RuplesJS #4: String Formatting
1505. RuplesJS #5: Range
1506. Russian plurals
1507. Russian postal code checker
1508. Saint Petersburg Paradox Model
1509. Same Birthday Probability
1510. Santa wish list form in ReactJS
1511. SantaClausable Interface
1512. Satisfying numbers
1513. Save Private Brain
1514. Scaling Squared Strings
1515. Scheduling (Round-Robin)
1516. Scheduling (Shortest Job First or SJF)
1517. Schrödinger's Boolean
1518. Scooby Doo Puzzle
1519. Scrambled Numbers Sorting
1520. Scraping: Codewars Top 500 Users
1521. Screen Locking Patterns
1522. Scrolling Text
1523. Search and sort names
1524. search in multidimensional array
1525. Seating arrangement at a Polyglot Summit
1526. Secret Agent 101: The secret password
1527. Secret knock
1528. Secret Message
1529. Secret Reverse Language Converter
1530. See You Next Happy Year
1531. Seeing Shows at the Edinburgh Fringe!
1532. Selective Array Reversing
1533. Selective fear of numbers
1534. self_converge
1535. Semi-Optional
1536. Sentence Calculator
1537. Sentences with Functions
1538. Separate The Wheat From The Chaff
1539. Separating Strings
1540. Sequence convergence
1541. Sequence to 1
1542. Series Forensics
1543. Set - the card game
1544. Seventh JSON of a seventh JSON
1545. Sexy Primes <3
1546. Shakespearean Tug of War
1547. Share prices
1548. Sharpen up
1549. Shop Inventory Manager
1550. Shorten Me: Array Declaration III (Fibonacci Last Digit)
1551. Shorten Me: Array Declaration IV (1-30)
1552. Shorten Me: Array Declaration IX (Variable Types)
1553. Shorten Me: Array Declaration V (Weekday & Weekend)
1554. Shorten Me: Array Declaration VI (Months)
1555. Shorten Me: Array Declaration VII (Alphabets)
1556. Shorten Me: Array Declaration VIII (Musical Scales)
1557. Shorten Me: Array Declaration X (O-I-II)
1558. Shorten Me: Array Declaration XI (Triangle)
1559. Shorten Me: Array Declaration XII (Constants)
1560. Shorten Me: Mad Mathematician's Algorithm VI (Power)
1561. shorter concat [reverse longer]
1562. Shortest Code : Are they symmetrical?
1563. Shortest code : Balance Attraction
1564. Shortest Code : Eat watermelon
1565. Shortest Code : Find the murderer
1566. Shortest Code : Guess the Hat
1567. Shortest Code : Jumping Dutch act
1568. Shortest Code : Planting Trees
1569. Shortest Code : Reading a Book
1570. Shortest Code : Regular expression compression
1571. Shortest Code : Remove screws I
1572. Shortest Code : Special factor
1573. Shortest code : Tidy up the room
1574. Shortest Code : Waiting for a Bus
1575. Shortest code: Bug in Apple
1576. Shortest Code: Collatz Array(Split or merge)
1577. Shortest code: Father and Son
1578. Shortest code: Give me the equation
1579. Shortest code: Max Value
1580. Shortest Code: Symmetric Sort
1581. Shortest Code: Trypophobia
1582. Shortest code: Virus in Apple
1583. Shortest Knight Path
1584. Shortest steps to a number
1585. Shrink the maze!
1586. SillyCASE
1587. Simple division
1588. Simple arithmetic progression
1589. Simple array product
1590. Simple Blackjack
1591. Simple Change Machine
1592. Simple Comparison?
1593. Simple consecutive pairs
1594. Simple digit code breaker
1595. Simple directions reversal
1596. Simple equation reversal
1597. Simple Events
1598. Simple eviternity numbers
1599. Simple fibonacci strings
1600. Simple fraction to mixed number converter
1601. Simple frequency sort
1602. Simple Fun #364: Not Too Random
1603. Simple Fun #365: Remove Number Game I
1604. Simple Fun #377: The Visible Posters II
1605. Simple Interest and Compound Interest
1606. Simple letter removal
1607. Simple Maths Test
1608. Simple max digit sum
1609. Simple Memory Manager
1610. Simple missing sum
1611. Simple nearest prime
1612. Simple non-decreasing array
1613. Simple number sequence
1614. Simple palindrome game
1615. Simple parenthesis removal
1616. Simple Physics Problem
1617. Simple prime streaming
1618. Simple repeated words
1619. Simple reversal game
1620. Simple reversed parenthesis
1621. Simple rotated palindromes
1622. Simple Ruby code formatter
1623. Simple safecracking
1624. Simple Simple Simple String Expansion
1625. Simple string characters
1626. Simple string division
1627. Simple string division II
1628. Simple string expansion
1629. Simple string indices
1630. Simple string matching
1631. Simple string reversal
1632. Simple string reversal II
1633. Simple Substitution Cipher Helper
1634. Simple sum of pairs
1635. Simple template
1636. Simple Time Bomb
1637. Simple time difference
1638. Simple Web Framework #1: Create a basic router
1639. simpleLog
1640. Simplify the number!
1641. Simplifying multilinear polynomials
1642. Simulating a Multiserver Queue
1643. Simultaneous Equations - Three Variables
1644. Single character palindromes
1645. Single character palindromes II
1646. Single-Use Tickets: Don't Let Anyone Sneak In!
1647. Singleton Pattern
1648. Sir , showMe yourID
1649. Slamming Lockers
1650. sliceBits(int, from, count)
1651. Sliding Puzzle Solver
1652. Smallest possible sum
1653. Smart Sum
1654. Smart Toaster
1655. Smith number
1656. SMS Lottery Bet Validator
1657. SMS Shortener
1658. Soccer Fixtures Results Table
1659. Socialist distribution
1660. Solomon's Quest for the Temporal Crystal
1661. Solve For X
1662. solve from sums
1663. Solve Rubik 's Cube by repetition
1664. Solving Quadratics
1665. Some Circles
1666. Something 's fishy...
1667. Sort and Transform
1668. sort array by last character
1669. Sort it out!
1670. Sort rectangles and circles by area
1671. Sort the climbing grades
1672. Sort the Gift Code
1673. Sort the Vowels!
1674. Sorted list
1675. Sorting Arrays by the Amount of Perfect Squares that Each Element May Generate
1676. Sorting the Rabbit Hole
1677. Sorting Time
1678. Space Invaders Underdog
1679. Spanish Conjugator
1680. Spanish Pirates off the Treasure Coast
1681. Sparse Ruler
1682. Sparse array split function
1683. Special Number (Special Numbers Series #5)
1684. Special Multiples
1685. Speech to Text - String Manipulation
1686. SpeedCode #1 - Getters and Setters in Object Literals
1687. SpeedCode #2 - Array Madness
1688. SpeedCode #3 × Fun with ES6 Classes #5 - Dogs and Classes
1689. SpeedCode #4 × Factory Functions #3 - Artefacts
1690. Spider man and his enemy
1691. Spidey Swings Across Town
1692. Spinning Rings
1693. Split an array
1694. Split and then add both sides of an array together.
1695. Split In Parts
1696. Split string for Text-to-Speech API
1697. Split The Bill
1698. Sports league table - help your local team!
1699. Spraying trees
1700. Spy Function
1701. Square sums (simple)
1702. Squarefree Part of a Number
1703. Squares sequence
1704. Stack Safe Recursion
1705. Stargate SG-1: Cute and Fuzzy (Improved version)
1706. Statistics - Fundamentals
1707. Statistics for an Athletic Association
1708. Steer the Ship
1709. Steps in k-primes
1710. Steven's Password Decryption
1711. Stock Position Size Calculator
1712. Stone bridge primes
1713. Stop it, HTML!
1714. Strange roman numbers
1715. String array duplicates
1716. String like [Char]
1717. String basics
1718. String Box
1719. String Breakers
1720. String character frequency
1721. String chunks
1722. String Compression Challenge
1723. String counting
1724. String doubles
1725. String Evaluation
1726. String formatter
1727. String Integer Greater-than
1728. String matchup
1729. String Merge!
1730. String reduction
1731. String Reordering
1732. String Scramble
1733. String subpattern recognition I
1734. String subpattern recognition II
1735. String subpattern recognition III
1736. Strings, strings, strings (Easy)
1737. Strings, strings, strings (Hard)
1738. Stutter function
1739. Sub-array division
1740. Subnet Calculating
1741. Sum #2
1742. Sum decomposition
1743. Sum of (Two) Squares
1744. Sum of a Sequence [Hard-Core Version]
1745. Sum of all arguments
1746. Sum of array singles
1747. Sum of differences between products and LCMs
1748. Sum of differences in array
1749. Sum of integer combinations
1750. Sum of integers in string
1751. Sum of prime-indexed elements
1752. Sum Only Numbers
1753. Sum The Strings: ARRAY EDITION
1754. Sum up the random string
1755. sum2total
1756. Summarize ranges
1757. Summy
1758. Super Class Extensions
1759. Super Smaaassh Brotheerrrs!
1760. Superphore Master
1761. Surface Area and Volume of a Trapezoidal Prism
1762. Sushi-go-round (Beginner's)
1763. Swap the head and the tail
1764. Swap two elements
1765. Swap two numbers
1766. Swarm bots - swarm intelligence #1
1767. Swedish Tipping
1768. Sweet Dreams are Made of Cheese
1769. Switch/Case - Bug Fixing #6
1770. Symbolic differentiation of prefix expressions
1771. Symbols counted
1772. Synchonizing records
1773. T.T.T. #7: Profit or loss
1774. T.T.T. #8: Reverse all
1775. T.T.T. #9: Peaks and valleys
1776. T.T.T.#2: Equal to 24
1777. T.T.T.#3: Three lifts
1778. T.T.T.#4: Key of door
1779. T.T.T.#5: Only you
1780. T.T.T.#6: nth user
1781. T.T.T.10: The largest square
1782. T.T.T.11: Three increasing numbers
1783. T.T.T.12: Split integer
1784. T.T.T.13: A game named "Five,Ten,Fifteen,Twenty"
1785. T.T.T.14: Find the largest "X"
1786. T.T.T.15: Sort the alarm clock
1787. T.T.T.16: Warning of Array.map()
1788. T.T.T.23: Silly birds
1789. T.T.T.24: Chinese surname (《百家姓》)
1790. T.T.T.33: Grandfather clock
1791. T.T.T.38: The sum of each digits
1792. T.T.T.40: m to n % 9
1793. T.T.T.41: The maximum profit
1794. T.T.T.43: The appellation of the Chinese people's age and his zodiac（中国人的年龄和他的生肖称谓）
1795. T.T.T.58: Simple face recognition system
1796. T.T.T.59: The language from the distant planet
1797. T.T.T.60: Break all the rules
1798. T.T.T.61: Alien's magic
1799. Tabs to spaces
1800. Tail Call Optimization
1801. Take an Arrow to the knee, Functionally
1802. Take It or Leave It Interview Strategy
1803. Take the Derivative
1804. Takeshi's Castle Spy: Knock Knock
1805. Talisman Board Game Combat System Checker
1806. Tank coding #1 : simple AIM systems
1807. Tap Into Mr. Mxyzinjin's Brain
1808. Tap Into Mr. Mxyzinjin's Matrix
1809. Tap Into Mr. Mxyzinjin's Safe
1810. Tap into Mr. Mxyzinjin's Stream
1811. Tap Into Mr. Mxyzinjin's Toy Safe
1812. Tap into Reivhax's robot
1813. Temp Tracker: Max, Min, Mean and Mode
1814. Template Strings
1815. Test for semiprime (Mathematics)
1816. Test Your Knowledge Of Function Scope
1817. Test's results
1818. Testing the Porges hypothesis
1819. Texas Hold'em Hands
1820. Text editor feature!
1821. The 'if' function
1822. The (nearly) Perfect Mirror
1823. The 196-algorithm and Lychrel numbers
1824. The answer to life the universe and everything.
1825. The Answer to the Ultimate Question of Life, The Universe, and Everything
1826. The Arpeggiator
1827. The average length
1828. The Baby Years III - First Tooth
1829. The boolean order
1830. The common directory path
1831. The Coupon Code
1832. The Cube Structure
1833. The Deca Tree
1834. The Desperate Rocket Scientist
1835. The Enigma Machine - Part 1: The Plugboard
1836. The fusc function -- Part 1
1837. The fusc function -- Part 2
1838. The good old olden early years
1839. the hidden thief
1840. The Ice Cream Vendors Dilema
1841. The Ladies of ENIAC
1842. The largest "mirror"
1843. The learning game - Machine Learning #1
1844. The longest bracket substring in the string
1845. The map and the keys
1846. The maximum sum value of ranges -- Ultimate version
1847. The money in the bank
1848. The most asked question on CodeWars
1849. The Most Repeated Letter.
1850. The Most Sacred of Days
1851. The observed PIN
1852. The Office II - Boredom Score
1853. The old switcheroo
1854. The old switcheroo 2
1855. The Overlap Time
1856. The Owls Are Not What They Seem
1857. The Power of Exponents
1858. The Prediction
1859. The Queen Of Hearts Challenge
1860. The queen on the chessboard
1861. The rarest pepe
1862. The Rhinestone Cowboy ~ Count the dollars in his boots!
1863. The sortReloaded() method
1864. The Sum and The Rest of Certain Pairs of Numbers have to be Perfect Squares (more Challenging)
1865. The Supermarket Queue
1866. The ugly truth about reduce
1867. The ugly truth about reduce (ii)
1868. The ugly truth about reduce (iii)
1869. The Walker
1870. There are two kinds of people
1871. They say that only the name is long enough to attract attention. They also said that only a simple Kata will have someone to solve it. This is a sadly story #1: Are they opposite?
1872. Thinkful - Logic Drills: Red and bumpy
1873. Thinkful - Number Drills: Blue and red marbles
1874. Thinkful - Object Drills: Vectors
1875. Thinking & Testing #38: What's the "?"
1876. Thinking & Testing : Archery contest
1877. Thinking & Testing : A happy day will come
1878. Thinking & Testing : Digital swimming pool
1879. Thinking & Testing : Falsetto Rap Concert
1880. Thinking & Testing : From nothingness To nothingness
1881. Thinking & Testing : Hail and Waterfall
1882. Thinking & Testing : How many "word"?
1883. Thinking & Testing : How many blocks?
1884. Thinking & Testing : I hate big and small
1885. Thinking & Testing : Incomplete string
1886. Thinking & Testing : Love Forever
1887. Thinking & Testing : Math of Middle school
1888. Thinking & Testing : Math of Primary School
1889. Thinking & Testing : Nebula or Vortex
1890. Thinking & Testing : Not perfect? Throw away!
1891. Thinking & Testing : Operator hidden in a string
1892. Thinking & Testing : Report about something
1893. Thinking & Testing : Retention and discard
1894. Thinking & Testing : Retention and discard II
1895. Thinking & Testing : Safe position
1896. Thinking & Testing : Something capitalized
1897. Thinking & Testing : Spatiotemporal index
1898. Thinking & Testing : Sport Star
1899. Thinking & Testing : Substring Magic
1900. Thinking & Testing : Sum of 15(Hetu Luosliu)
1901. Thinking & Testing : The repair of parchment
1902. Thinking & Testing : True or False
1903. Thinking & Testing : Uniq or not Uniq
1904. Thinking & Testing : Who are you?
1905. Thinking & Testing : Wind whispers
1906. Thinking & Testing: A and B?
1907. This isn't what you think! The Misadventures of Bob the Highly Paid Consultant #2
1908. THIS n' THAT
1909. Three added Characters
1910. Three Dots--Play game Series #8
1911. Throw from list - Error Handling #3
1912. Thue-Morse Sequence
1913. Tic-Tac-Toe Checker
1914. Tic-Tac-Toe-like table Generator
1915. Ticker
1916. Tidy Number (Special Numbers Series #9)
1917. Time Conversion: 12s and 24s
1918. Time Converter: hours, minutes, seconds and milliseconds
1919. Time Degrees
1920. Time Simulation
1921. Timers
1922. To BrainFuck Transpiler
1923. toHonestlyFixed()
1924. ToLeetSpeak
1925. Tom's Allergies
1926. Tombola - validation
1927. Total Resistance in a Parallel Circuit
1928. Touching Rectangles
1929. Tower Defense: Risk Analysis
1930. Track the Ball
1931. Tracking Hits for Different Sum Values for Different Kinds of Dice
1932. Tracking Sums in a Process
1933. Train to remove duplicates from an array with filter()
1934. Training JS #1: create your first JS function and print "Hello World!"
1935. Training JS #10: loop statement --for
1936. Training JS #11: loop statement --break,continue
1937. Training JS #12: loop statement --for..in and for..of
1938. Training JS #13: Number object and its properties
1939. Training JS #14: Methods of Number object--toString() and toLocaleString()
1940. Training JS #15: Methods of Number object--toFixed(), toExponential() and toPrecision()
1941. Training JS #16: Methods of String object--slice(), substring() and substr()
1942. Training JS #17: Methods of String object--indexOf(), lastIndexOf() and search()
1943. Training JS #18: Methods of String object--concat() split() and its good friend join()
1944. Training JS #19: Methods of String object--toUpperCase() toLowerCase() and replace()
1945. Training JS #2: Basic data types--Number
1946. Training JS #20: Methods of String object--charAt() charCodeAt() and fromCharCode()
1947. Training JS #21: Methods of String object--trim() and the string template
1948. Training JS #22: Unlock new skills--Arrow function,spread operator and deconstruction
1949. Training JS #23: methods of arrayObject---push(), pop(), shift() and unshift()
1950. Training JS #24: methods of arrayObject---splice() and slice()
1951. Training JS #25: methods of arrayObject---reverse() and sort()
1952. Training JS #26: methods of arrayObject---map()
1953. Training JS #27: methods of arrayObject---filter()
1954. Training JS #28: methods of arrayObject---every() and some()
1955. Training JS #29: methods of arrayObject---concat() and join()
1956. Training JS #3: Basic data types--String
1957. Training JS #30: methods of arrayObject---reduce() and reduceRight()
1958. Training JS #31: methods of arrayObject---isArray() indexOf() and toString()
1959. Training JS #32: methods of Math---round() ceil() and floor()
1960. Training JS #33: methods of Math---max() min() and abs()
1961. Training JS #35: methods of Math---log() and its family
1962. Training JS #36: methods of Math---kata author's lover:random()
1963. Training JS #37: Unlock new weapon---RegExp Object
1964. Training JS #38: Regular Expression--"^","$", "." and test()
1965. Training JS #39: Regular Expression--"?", "*", "+" and "{}"
1966. Training JS #4: Basic data types--Array
1967. Training JS #40: Regular Expression--"|", "[]" and "()"
1968. Training JS #41: Regular Expression--""
1969. Training JS #42: Regular Expression--( ?: ), ( ?= ) and ( ?! )
1970. Training JS #5: Basic data types--Object
1971. Training JS #6: Basic data types--Boolean and conditional statements if..else
1972. Training JS #7: if..else and ternary operator
1973. Training JS #8: Conditional statement--switch
1974. Training JS #9: loop statement --while and do..while
1975. Training Random Testcases #2: Palindrome string
1976. Tram Capacity
1977. Transform To Prime
1978. Transforming Maze Solver
1979. Translate DNA in 6 frames
1980. Transpose of a Matrix
1981. Traverse array elements diagonally
1982. Treasure Box
1983. Tree Depth
1984. Tree Directory
1985. Triangle Line Task: Fizz Buzz
1986. Triangle of Multiples (Easy One)
1987. Triangular matrices.
1988. Tribonacci Sequence
1989. Triple Shiftian Numbers
1990. Triple trouble
1991. Troll Mystery Encoding
1992. Truck driving time(Level I)
1993. Trucks Driver Time.
1994. True Addition
1995. True Min
1996. Trumpness detector
1997. Truncate a string!
1998. Tube strike options calculator
1999. Turn any word into a beef taco
2000. TV channels
2001. Twice Their Age
2002. Two arrays -- Zero rows and zero columns
2003. Two cube sums
2004. Two's complement
2005. Two's Complement
2006. Type of sum
2007. Typoglycemia Generator
2008. UN-usual Sort
2009. Unary function chainer
2010. Understanding closures - the basics
2011. Unicode Madness: 東方名確認　～ Eastern Title Validator.
2012. UniDecoder
2013. Union of Intervals
2014. Unique digits sequence
2015. Unique string characters
2016. Unique Sum
2017. uniquePush - No Dupes!
2018. Unit-Test Inception
2019. Unix command line ls -l extract the file type.
2020. Unlucky Days
2021. Unpacking Arguments
2022. Unsecure login - Hack this code #1
2023. Unshackle the Beast (uncontrolled components in ReactJS)
2024. up AND down
2025. upperCasePlace()
2026. Upside down numbers
2027. Upside-Down Numbers - Challenge Edition
2028. Upside-Down Pyramid Addition...REVERSED!
2029. Upstream/Downstream
2030. Upturn Numeral Triangle
2031. Urban Dictionary
2032. URI codec (encode/decode)
2033. UriBuilder
2034. UVB-76 Message Validator
2035. Valid Curly Braces (Code Golf)
2036. Valid GB number plate?
2037. Valid HK Phone Number
2038. Vending Machine
2039. Vertical symmetry on coordinate plane
2040. Visa application centre
2041. Visible Dots On a Die
2042. Volume of a Cuboid
2043. Vowel Alternations
2044. Vowel one
2045. Vowel Shifting
2046. Vowel-consonant lexicon
2047. Walk-up Stairs
2048. Walter's miraculous FizzBuzz factory
2049. Warm Up for Speed.
2050. Warrior's adventure
2051. Waving the Stream
2052. We are Family
2053. We are the Robots d[(0)(0)]b
2054. We need these data immediately!
2055. Weight of its Contents
2056. Weighted Grading System
2057. Weird Factory
2058. Welcome to Economics! #1 Consumer Price Index
2059. Welcome to Economics! #2 Economic Surplus
2060. What Happened To My Object?
2061. What happened to the vowels?
2062. What The Biggest Search Keys?
2063. What's a Perfect Power anyway?
2064. What's in a name?
2065. What's the pattern?
2066. What’s the degree?
2067. When's my birthday ?
2068. When's the next train to Brighton?
2069. Where did my Ether go?
2070. Where do they meet?
2071. Which are in?
2072. Which Gas Station should I pick?
2073. Whitespace Interpreter
2074. Who ate the cookie?
2075. Who can still win the Formula One World Championship?
2076. Who is going to pay for the wall?
2077. Who wins the card game?
2078. Whole of Names
2079. Whose bicycle?
2080. Word Challenges at School
2081. Word Finder
2082. Word Segmentation: MaxMatch
2083. Wordify an integer
2084. Wordsearch
2085. WordSquare
2086. Working With Coloured Numbers
2087. Working With Coloured Numbers II
2088. Working with Dictionaries
2089. World Bits War
2090. World Rally Championship
2091. Wrapped Function
2092. Write a function to sort a given string into alphabetical order
2093. Write a letter to your friend (给远方的朋友写封信)
2094. Write out numbers
2095. X marks the spot!
2096. X plus Y Card problem
2097. xml to object - xml #1
2098. XOR string reduction
2099. YaCG: #1 Yet another Card Kata !
2100. YaCG: #2 One Trick, One Taker.
2101. YaCG: #3 "no elephant were harmed..."
2102. Yes No Yes No
2103. You are a Cube!
2104. You Can't Code Under Pressure #2
2105. You're not my type
2106. Your Ride Is Here
2107. Zebulan's Nightmare
2108. Zero fill... for the Queen!
2109. zero-balanced Array
2110. Zeros and Ones
2111. Ziggurat Ride of Fortune