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<head>
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<title>BQN: Question Mark (?)</title>
</head>
<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="question-mark-"><a class="header" href="#question-mark-">Question Mark (<code><span class='Head'>?</span></code>)</a></h1>
<h2 id="-predicate"><a class="header" href="#-predicate"><code><span class='Head'>?</span></code>: Predicate</a></h2>
<p><a class="fulldoc" href="../doc/block.html#predicates">→full documentation</a></p>
<p>Follows a statement in a block, which must return 0 or 1. If it's 0, stop the current body and evaluate the next eligible one instead. Variables defined before the <code><span class='Head'>?</span></code> stay if execution continues (1) but don't carry over to other bodies (0).</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ezAgPyAzIDsgNH0KCk1pbiDihpAge/Cdlag88J2VqSA/IPCdlaggOyDwnZWpfQoKMyBNaW4gNQoKNCBNaW4gMg==">↗️</a><pre> <span class='Brace'>{</span><span class='Number'>0</span> <span class='Head'>?</span> <span class='Number'>3</span> <span class='Head'>;</span> <span class='Number'>4</span><span class='Brace'>}</span>
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<span class='Function'>Min</span> <span class='Gets'>←</span> <span class='Brace'>{</span><span class='Value'>𝕨</span><span class='Function'><</span><span class='Value'>𝕩</span> <span class='Head'>?</span> <span class='Value'>𝕨</span> <span class='Head'>;</span> <span class='Value'>𝕩</span><span class='Brace'>}</span>
<span class='Number'>3</span> <span class='Function'>Min</span> <span class='Number'>5</span>
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<span class='Number'>4</span> <span class='Function'>Min</span> <span class='Number'>2</span>
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