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clojure+/print/objects_and_protocols.html

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<meta name="author" content="Timothy Pratley">
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<title>Printing Objects in Clojure – Clojure Civitas</title>
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<title>Printing Objects and Protocols in Clojure – Clojure Civitas</title>
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<meta property="og:title" content="Printing Objects and Protocols in Clojure – Clojure Civitas">
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<header id="title-block-header" class="quarto-title-block default">
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<h1 class="title">Printing Objects in Clojure</h1>
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<h1 class="title">Printing Objects and Protocols in Clojure</h1>
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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">0x5722b830</span> <span class="st">"clojure.lang.MultiFn@5722b830"</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">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="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">0x20b60f8c</span> <span class="st">"java.lang.Object@20b60f8c"</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">0x301ac9bb</span> <span class="st">"java.lang.Object@301ac9bb"</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>. This can get pretty ugly:</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">0x602947e7</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@602947e7"</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">0x71d3da3a</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@71d3da3a"</span>]</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<p><a href="https://github.com/tonsky/clojure-plus">clojure-plus</a> provides print-methods to improve printing many things.</p>
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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">0x5722b830</span> <span class="st">"clojure.lang.MultiFn@5722b830"</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">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="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">0x4bdf1bbe</span> <span class="st">"java.lang.Object@4bdf1bbe"</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">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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<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">0x381e35a2</span> <span class="st">"clojure.core.async.impl.channels.ManyToManyChannel@381e35a2"</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">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="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">0x63540ec4</span> <span class="st">"clojure.print_object.remove_extraneous$eval22346$fn__22347@63540ec4"</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">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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<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$fn__22352 <span class="bn">0x4b6607a</span> <span class="st">"clojure.print_object.remove_extraneous$eval22350$fn__22351$fn__22352@4b6607a"</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$fn__22352 <span class="bn">0x677f0c10</span> <span class="st">"clojure.print_object.remove_extraneous$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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<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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