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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">0x628f8ac1</span> <span class="st">"clojure.lang.MultiFn@628f8ac1"</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">0x4608876e</span> <span class="st">"clojure.lang.MultiFn@4608876e"</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">0x40d8e4f6</span> <span class="st">"java.lang.Object@40d8e4f6"</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">0x7967b127</span> <span class="st">"java.lang.Object@7967b127"</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">0x37347be1</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@37347be1"</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">0x48fe904f</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@48fe904f"</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="quarto-figure quarto-figure-center">
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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$eval22473$fn__22474 <span class="bn">0x7c8c5798</span> <span class="st">"clojure.print_object.remove_extraneous$eval22473$fn__22474@7c8c5798"</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$eval22473$fn__22474 <span class="bn">0x183c30f1</span> <span class="st">"clojure.print_object.remove_extraneous$eval22473$fn__22474@183c30f1"</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$eval22477$fn__22478$fn__22479 <span class="bn">0x56ac955c</span> <span class="st">"clojure.print_object.remove_extraneous$eval22477$fn__22478$fn__22479@56ac955c"</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$eval22477$fn__22478$fn__22479 <span class="bn">0x371c40ee</span> <span class="st">"clojure.print_object.remove_extraneous$eval22477$fn__22478$fn__22479@371c40ee"</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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‎pages.html‎

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‎posts.xml‎

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<div class="sourceCode" id="cb2" style="background: #f1f3f5;"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb2-1">#object[clojure.lang.MultiFn <span class="bn" style="color: #AD0000;
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<div class="sourceCode" id="cb3" style="background: #f1f3f5;"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb3-1">(Object.)</span></code></pre></div>
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<div class="sourceCode" id="cb4" style="background: #f1f3f5;"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb4-1">#object[java.lang.Object <span class="bn" style="color: #AD0000;
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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="cb6" style="background: #f1f3f5;"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb6-1">#object[clojure.core.async.impl.channels.ManyToManyChannel <span class="bn" style="color: #AD0000;
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<div class="sourceCode" id="cb8" style="background: #f1f3f5;"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb8-1">#object[clojure.print_object.remove_extraneous$eval22473$fn__22474 <span class="bn" style="color: #AD0000;
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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="cb10" style="background: #f1f3f5;"><pre class="sourceCode clojure code-with-copy"><code class="sourceCode clojure"><span id="cb10-1">#object[clojure.print_object.remove_extraneous$eval22477$fn__22478$fn__22479 <span class="bn" style="color: #AD0000;
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<p>Yikes! what an eyesore. This is not an academic issue specific to lambda calculus. Any function created from inside a function is helpfully identifiable through the <code>fn$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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