36 lines
No EOL
2.3 KiB
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36 lines
No EOL
2.3 KiB
HTML
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<title>Text.index_of — Ludic</title>
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<meta name="description" content="The byte index of a substring, or -1 if absent.">
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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.index_of</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.index_of</h1>
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</div>
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<code class="sig">Text.index_of(s, sub) -> int</code>
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<div class="desc"><p>Returns the zero-based byte index where <code>sub</code> first appears in <code>s</code>, or <code>-1</code> if it never does — so <code>Text.index_of("hello world", "world")</code> is <code>6</code>. Use it to locate a separator before slicing, or as a present-and-where test in one call: guard with <code>if idx >= 0</code>. It reports the first match only.</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 search</span></div><div class="param" id="param-sub"><code class="pname">sub</code><span class="pdesc">the substring to locate</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program KeyValue {
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var pair: string = "hp=42"
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handler Parse phase Update {
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let eq = Text.index_of(pair, "=") # 2
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let key = Text.slice(pair, 0, eq) # "hp"
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let value = Text.to_int(Text.slice(pair, eq + 1, Text.length(pair)))
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}
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}</pre></div>
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