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‎.nojekyll‎

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‎clojure/print_object/remove_extraneous.html‎

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<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a> (<span class="va">#'clojure.core/print-object</span> x w))</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb2"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.lang.MultiFn <span class="bn">0x3eb022c2</span> <span class="st">"clojure.lang.MultiFn@3eb022c2"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb2"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.lang.MultiFn <span class="bn">0x45456cd1</span> <span class="st">"clojure.lang.MultiFn@45456cd1"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb3"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>(Object.)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb4"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>#object[java.lang.Object <span class="bn">0x232f05b0</span> <span class="st">"java.lang.Object@232f05b0"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb4"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>#object[java.lang.Object <span class="bn">0x63c7beef</span> <span class="st">"java.lang.Object@63c7beef"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<p>The syntax is <code>#object[CLASS-NAME HASH toString())]</code> and as you can see, the toString of an Object is <code>CLASS-NAME@HASH</code>. For most objects this becomes quite a long string.</p>
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<div class="sourceCode" id="cb5"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>(async/chan)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb6"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.core.async.impl.channels.ManyToManyChannel <span class="bn">0x40a0c58c</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@40a0c58c"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb6"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.core.async.impl.channels.ManyToManyChannel <span class="bn">0x259e235e</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@259e235e"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb7"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>(<span class="kw">fn</span> [x] x)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb8"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.print_object.remove_extraneous$eval22346$fn__22347 <span class="bn">0x43f3ff50</span> <span class="st">"clojure.print_object.remove_extraneous$eval22346$fn__22347@43f3ff50"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb8"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.print_object.remove_extraneous$eval22346$fn__22347 <span class="bn">0x5b2e4796</span> <span class="st">"clojure.print_object.remove_extraneous$eval22346$fn__22347@5b2e4796"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<p>It’s quite easy to miss the fact that it is a function as we are looking for a tiny little <code>fn</code> in a sea of text. If, like me, you are fond of the <a href="../../code_interview/beating/with_stupid_stuff/z_combinator_gambit.html">odd lambda calculus excursion</a>, things get even more hectic.</p>
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<div class="sourceCode" id="cb9"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a>((<span class="kw">fn</span> [x] (<span class="kw">fn</span> [v] ((x x) v))) (<span class="kw">fn</span> [y] y))</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb10"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.print_object.remove_extraneous$eval22350$fn__22351$fn__22352 <span class="bn">0x677f0c10</span> <span class="st">"clojure.print_object.remove_extraneous$eval22350$fn__22351$fn__22352@677f0c10"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb10"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a>#object[clojure.print_object.remove_extraneous$eval22350$fn__22351$fn__22352 <span class="bn">0x6b94ada6</span> <span class="st">"clojure.print_object.remove_extraneous$eval22350$fn__22351$fn__22352@6b94ada6"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<p>Yikes! what an eyesore. This is not an academic issue specific to lambda calculus. Any function created from inside a function is helpfully identifiable through the <code>fn$fn</code> nesting. We create these quite regularly, and they are often printed in stack traces. I’m sure you have seen them when you map an inline function across a seq, and there is a bug in the anonymous function.</p>
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‎clojure_camp/pairing.html‎

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<h1 class="title">A few examples of Transducers</h1>
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<p class="author"><a href="https://github.com/seancorfield">Sean Corfield</a> </p>
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Clojure Camp
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<p class="author"><a href="https://timothypratley.blogspot.com/p/httpswww.html">Timothy Pratley</a> <a href="mailto:timothypratley@gmail.com" class="quarto-title-author-email"><i class="bi bi-envelope"></i></a> </p>
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Hummi
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<div class="sourceCode" id="cb1"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>(<span class="kw">ns</span> clojure-camp.pairing)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<div class="sourceCode" id="cb1"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a>^{<span class="at">:clay</span></span>
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<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a> {<span class="at">:quarto</span> {<span class="at">:title</span> <span class="st">"A few examples of Transducers"</span></span>
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<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a> <span class="at">:author</span> [<span class="at">:seancorfield</span> <span class="at">:timothypratley</span>]</span>
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<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a> <span class="at">:date</span> <span class="st">"2025-05-30"</span></span>
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<span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a> <span class="at">:tags</span> [<span class="at">:transducers</span> <span class="at">:lazy-sequences</span> <span class="at">:xforms</span>]</span>
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<span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a> <span class="at">:keywords</span> [<span class="at">:transducers</span>]}}}</span>
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<span id="cb1-9"><a href="#cb1-9" aria-hidden="true" tabindex="-1"></a>(<span class="kw">ns</span> clojure-camp.pairing)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<p>let’s work on an algorithm together!</p>
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<p>let’s work on a post together!</p>
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<p>this produces a lazy sequence of strings:</p>
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<div class="sourceCode" id="cb2"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a>(<span class="kw">map</span> #(<span class="kw">str</span> <span class="st">"Hello, "</span> <span class="va">%</span> <span class="st">"!"</span>) [<span class="st">"Alice"</span> <span class="st">"Bob"</span> <span class="st">"Charlie"</span>])</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>

‎listings.json‎

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‎pages.html‎

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‎posts.html‎

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<a href="./clojure_camp/pairing.html" class="no-external">A few examples of Transducers</a>
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May 30, 2025
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Sean Corfield, Timothy Pratley
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