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33 lines
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1.9 KiB
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<title>is_some — Ludic</title>
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<meta name="description" content="True when an option holds a value.">
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">is_some</span></div>
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<div class="item-head">
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<span class="kind-badge kind-builtin">function</span>
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<h1 id="top">is_some</h1>
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<code class="sig">is_some(o: option) -> bool</code>
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<div class="desc"><p>Returns true when an <code>option</code> holds a value (it is <a href="fn-some"><code>some</code></a>, not <a href="fn-none"><code>none</code></a>) — the guard before acting on an optional target or slot.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-o"><code class="pname">o</code><span class="pdesc">the option to test</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program AI {
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handler Step phase Update {
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let target = none()
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if is_some(target) { chase(unwrap_or(target, 0)) }
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}
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}</pre></div>
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