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33 lines
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1.9 KiB
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<title>Uuid.nil — Ludic</title>
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<meta name="description" content="The all-zero UUID.">
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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-uuid.html">Uuid</a> <span>›</span> <span class="here">Uuid.nil</span></div>
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Uuid.nil</h1>
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</div>
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<code class="sig">Uuid.nil() -> string</code>
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<div class="desc"><p>Returns the nil UUID — <code>00000000-0000-0000-0000-000000000000</code> — the reserved all-zero value that means "no UUID". Use it as a sentinel for an unset or absent identity, and as the value <a href="uuid-parse"><code>Uuid.parse</code></a> returns when it is handed something that is not a valid UUID. It is a well-formed UUID string, so it passes <a href="uuid-is_valid"><code>Uuid.is_valid</code></a>; test for "no id" by comparing against <code>Uuid.nil()</code> explicitly.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Nil {
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entry {
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let none = Uuid.nil()
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print(none) # 00000000-0000-0000-0000-000000000000
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}
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}</pre></div>
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