37 lines
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2.2 KiB
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37 lines
No EOL
2.2 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>is_ok — Ludic</title>
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<meta name="description" content="True when a result carries a success payload.">
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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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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">is_ok</span></div>
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<div class="item-head">
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<span class="kind-badge kind-builtin">function</span>
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<h1 id="top">is_ok</h1>
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</div>
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<code class="sig">is_ok(r: result) -> bool</code>
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<div class="desc"><p>Tests a <code>result</code>'s tag: <code>true</code> when it was built with <a href="fn-ok"><code>ok</code></a>, <code>false</code> when it was built with <a href="fn-err"><code>err</code></a>. Use it when you want to branch on success without unwrapping the payload — the payload itself is recovered with <a href="kw-try"><code>try</code></a>/<code>else</code>. It is the exact negation of <a href="fn-is_err"><code>is_err</code></a>.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-r"><code class="pname">r</code><span class="pdesc">the result to test</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Check {
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function find(x: int) -> result {
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if x == 7 { return ok(x) }
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return err("missing")
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}
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test "is_ok classifies without unwrapping" {
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expect(is_ok(find(7)))
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expect(not is_ok(find(3)))
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}
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}</pre></div>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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