36 lines
No EOL
2.2 KiB
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36 lines
No EOL
2.2 KiB
HTML
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<title>Text.starts_with — Ludic</title>
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<meta name="description" content="Whether a string begins with a given prefix.">
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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-text.html">Text</a> <span>›</span> <span class="here">Text.starts_with</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">Text.starts_with</h1>
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</div>
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<code class="sig">Text.starts_with(s, prefix) -> bool</code>
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<div class="desc"><p>Returns <code>true</code> when <code>s</code> begins with <code>prefix</code>, comparing byte for byte over the length of the prefix. An empty prefix always matches. Use it to route commands (<code>"/help ..."</code>), recognize a tag, or branch on a filename extension without slicing first.</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 string to test</span></div><div class="param" id="param-prefix"><code class="pname">prefix</code><span class="pdesc">the leading substring to look for</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Command {
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var input: string = "/say hello"
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handler Parse phase Update {
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if Text.starts_with(input, "/say ") {
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let msg = Text.slice(input, 5, Text.length(input))
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}
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}
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}</pre></div>
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