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36 lines
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2 KiB
HTML
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>List.first — Ludic</title>
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<meta name="description" content="The first element of a slice.">
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<link rel="stylesheet" href="docs.css">
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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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<main class="wrap item">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-list.html">List</a> <span>›</span> <span class="here">List.first</span></div>
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<div class="item-head">
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">List.first</h1>
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</div>
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<code class="sig">List.first(s) -> T</code>
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<div class="desc"><p>Returns element <code>0</code> of <code>s</code> — the same as <code>s[0]</code>, named for readability. The slice must hold at least one element; calling it on an empty slice reads out of bounds, so guard with <code>List.len(s) > 0</code> when that is possible. Use it to peek at the head of a queue or the front of an ordered list.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-s"><code class="pname">s</code><span class="pdesc">a non-empty slice</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Queue {
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var waiting: []int = new []int
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handler Serve phase Update {
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if List.len(waiting) > 0 {
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let next = List.first(waiting)
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}
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}
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}</pre></div>
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<script src="ludic-highlight.js"></script>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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