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35 lines
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2.2 KiB
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<title>Text.char_at — Ludic</title>
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<meta name="description" content="The byte value at an index, 0..255.">
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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.char_at</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.char_at</h1>
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</div>
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<code class="sig">Text.char_at(s, i) -> int</code>
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<div class="desc"><p>Returns the byte at position <code>i</code> in <code>s</code> as an <code>int</code> in the range <code>0</code>..<code>255</code> — for example <code>Text.char_at("hello", 0)</code> is <code>104</code>, the code for <code>h</code>. Indices are zero-based and count bytes. Use it to inspect or classify individual characters, such as testing whether a key of input is a digit.</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 read from</span></div><div class="param" id="param-i"><code class="pname">i</code><span class="pdesc">the zero-based byte index</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program FirstIsDigit {
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var entry: string = "7up"
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handler Check phase Update {
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let c = Text.char_at(entry, 0)
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let is_digit = c >= 48 and c <= 57 # true: '7'
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}
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}</pre></div>
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