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51 lines
No EOL
2.9 KiB
HTML
<!doctype html>
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<head>
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<meta charset="utf-8">
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<title>if / else — Ludic</title>
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<meta name="description" content="A branch — run one block when a condition holds, another when it doesn't.">
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<body>
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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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<main class="wrap item">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#control">Control flow</a> <span>›</span> <span class="here">if / else</span></div>
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<div class="item-head">
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<span class="kind-badge kind-keyword">keyword</span>
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<h1 id="top">if / else</h1>
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</div>
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<code class="sig">if cond { … } else { … }</code>
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<div class="desc"><p>An <code>if</code> runs its block when the condition is true; an optional <code>else</code> block runs when it is false, and the <code>else</code> may itself be another <code>if</code> to form a ladder. The condition is a plain boolean expression with <b>no surrounding parentheses</b>, and the braces are always required even for a single statement. Ludic's boolean operators are the words <code>and</code>, <code>or</code> and <code>not</code> (not <code>&&</code>/<code>||</code>/<code>!</code>), and note that bitwise operators bind tighter than comparison, so <code>flags & MASK == 0</code> already means <code>(flags & MASK) == 0</code>. When the branches grow into a chain testing one value against several constants, reach for <code>match</code> instead.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Threshold {
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property Health { current: int = 100, maximum: int = 100 }
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model Player { Health }
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handler Boot phase Start {
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spawn Hero { Health { current: 25 } }
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}
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handler DrawWorld phase Render {
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Screen.clear(Color.MidnightBlue)
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for (health) in query [Health, {Player}] {
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if health.current <= 0 {
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Screen.draw_text(x: 8, y: 8, text: "DEFEATED", color: Color.Crimson, scale: 2)
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} else {
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if health.current < 30 {
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Screen.draw_text(x: 8, y: 8, text: "DANGER", color: Color.Gold, scale: 2)
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} else {
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Screen.draw_text(x: 8, y: 8, text: "OK", color: Color.LimeGreen, scale: 2)
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}
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}
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}
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Screen.show()
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}
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}</pre></div>
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</main>
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<script src="ludic-highlight.js"></script>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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