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<title>BQN: Leftwards Arrow With Hook (↩)</title>
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<div class="nav">(<a href="https://github.com/mlochbaum/BQN">github</a>) / <a href="../index.html">BQN</a> / <a href="index.html">help</a></div>
<h1 id="leftwards-arrow-with-hook-"><a class="header" href="#leftwards-arrow-with-hook-">Leftwards Arrow With Hook (<code><span class='Gets'>↩</span></code>)</a></h1>
<h2 id="n--v-change"><a class="header" href="#n--v-change"><code><span class='Value'>n</span> <span class='Gets'>↩</span> <span class='Value'>v</span></code>: Change</a></h2>
<p><a class="fulldoc" href="../doc/expression.html#assignment">→full documentation</a></p>
<p>Changes the value of variable with name <code><span class='Value'>n</span></code> to value <code><span class='Value'>v</span></code>.</p>
<p>Variable <code><span class='Value'>n</span></code> must already exist.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=YSDihqkgMQoK4oqiIGIg4oaQIDMKCuKKoiBiIOKGqSAiQmUgdGhlIGNoYW5nZSB5b3Ugd2lzaCB0byBzZWUgaW4gdGhlIHdvcmxkLiI=">↗️</a><pre> <span class='Value'>a</span> <span class='Gets'>↩</span> <span class='Number'>1</span>
<span class='Error'>Error: Undefined identifier</span>
<span class='Function'>⊢</span> <span class='Value'>b</span> <span class='Gets'>←</span> <span class='Number'>3</span>
3
<span class='Function'>⊢</span> <span class='Value'>b</span> <span class='Gets'>↩</span> <span class='String'>"Be the change you wish to see in the world."</span>
"Be the change you wish to see in the world."
</pre>
<h2 id="n-f-modify"><a class="header" href="#n-f-modify"><code><span class='Value'>n</span> <span class='Function'>F</span><span class='Gets'>↩</span></code>: Modify</a></h2>
<p><a class="fulldoc" href="../doc/expression.html#assignment">→full documentation</a></p>
<p>Apply function <code><span class='Function'>F</span></code> to existing variable <code><span class='Value'>n</span></code>, and assign the result back to <code><span class='Value'>n</span></code>.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oqiIGIg4oy94oap">↗️</a><pre> <span class='Function'>⊢</span> <span class='Value'>b</span> <span class='Function'>⌽</span><span class='Gets'>↩</span>
".dlrow eht ni ees ot hsiw uoy egnahc eht eB"
</pre>
<h2 id="n-f-v-modify"><a class="header" href="#n-f-v-modify"><code><span class='Value'>n</span> <span class='Function'>F</span><span class='Gets'>↩</span> <span class='Value'>v</span></code>: Modify</a></h2>
<p><a class="fulldoc" href="../doc/expression.html#assignment">→full documentation</a></p>
<p>Assign <code><span class='Value'>n</span> <span class='Function'>F</span> <span class='Value'>v</span></code> to <code><span class='Value'>n</span></code>.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oqiIGIg4oaTy5zihqkgNg==">↗️</a><pre> <span class='Function'>⊢</span> <span class='Value'>b</span> <span class='Function'>↓</span><span class='Modifier'>˜</span><span class='Gets'>↩</span> <span class='Number'>6</span>
" eht ni ees ot hsiw uoy egnahc eht eB"
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