37 lines
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2.3 KiB
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37 lines
No EOL
2.3 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.swap — Ludic</title>
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<meta name="description" content="Exchange the elements at two indices.">
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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="ns-list.html">List</a> <span>›</span> <span class="here">List.swap</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.swap</h1>
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</div>
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<code class="sig">List.swap(s, i, j) -> void</code>
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<div class="desc"><p>Exchanges the elements at indices <code>i</code> and <code>j</code> in <code>s</code>, in place. Both indices must be within the slice. Swapping is the building block of shuffles, sorts, and moving an item to the end before <code>List.pop</code> to remove it cheaply without shifting the rest.</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">the slice to modify</span></div><div class="param" id="param-i"><code class="pname">i</code><span class="pdesc">the first index</span></div><div class="param" id="param-j"><code class="pname">j</code><span class="pdesc">the second index</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program RemoveFast {
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var actors: []int = new []int
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handler Kill phase Update {
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let dead = 2
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let last = List.len(actors) - 1
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List.swap(actors, dead, last) # move it to the end...
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let removed = List.pop(actors) # ...then drop it
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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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