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+<title>function — Ludic</title>
+<meta name="description" content="A function — reusable logic called positionally or with named arguments.">
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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#structure">Program structure</a> <span>›</span> <span class="here">function</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-keyword">keyword</span>
+    <h1 id="top">function</h1>
+  </div>
+  <code class="sig">function name(a: T, b: T) -&gt; R { … }</code>
+  <div class="desc"><p>A <code>function</code> declares a function: a reusable block of logic with typed parameters and a return type, written <code>-> R</code> (use <code>-> void</code> for one that returns nothing). Call it positionally, <code>heal(2, 10)</code>, or with named arguments, <code>heal(amount: 2, maximum: 10)</code>, which reads more clearly at the call site and is the house style. Functions live at program scope alongside handlers and may be called from any handler; they can <code>spawn</code>, run queries, and read program-scope state. Use them to factor out logic shared by several handlers so each handler stays short.</p></div>
+  
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program Healer {
+  property Health { current: int = 100, maximum: int = 100 }
+  model Player { Health }
+
+  function heal(amount: int, maximum: int) -&gt; int {
+    let restored = amount * 2
+    if restored &gt; maximum { return maximum }
+    return restored
+  }
+
+  handler Boot phase Start {
+    spawn Hero { Health { current: 10, maximum: 100 } }
+  }
+
+  handler Recover phase Update {
+    for (health) in query [Health, {Player}] {
+      health.current = heal(amount: health.current, maximum: health.maximum)
+    }
+  }
+}</pre></div>
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