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+<title>none — Ludic</title>
+<meta name="description" content="The empty option — a missing value.">
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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">none</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-builtin">function</span>
+    <h1 id="top">none</h1>
+  </div>
+  <code class="sig">none() -&gt; option</code>
+  <div class="desc"><p>The empty <code>option</code> — a missing value with no sentinel. Return it when there is nothing to give: no target, an empty slot, a lookup that missed. The caller distinguishes it from <a href="fn-some"><code>some</code></a> with <a href="fn-is_none"><code>is_none</code></a> / <a href="fn-is_some"><code>is_some</code></a>, or supplies a default with <a href="fn-unwrap_or"><code>unwrap_or</code></a>.</p></div>
+  
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program Slots {
+  function held(slot: int) -&gt; option {
+    if slot &lt; 0 { return none() }
+    return some(slot)
+  }
+  test "none is empty" {
+    expect_eq(is_none(held(0 - 1)), true)
+  }
+}</pre></div>
+  
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