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2.1 KiB
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37 lines
No EOL
2.1 KiB
HTML
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<title>Query.count — Ludic</title>
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<meta name="description" content="How many live entities carry a property.">
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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-query.html">Query</a> <span>›</span> <span class="here">Query.count</span></div>
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<div class="item-head">
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Query.count</h1>
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</div>
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<code class="sig">Query.count(prop) -> int</code>
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<div class="desc"><p>Returns the number of live entities that carry the property <code>prop</code> (a property id from <a href="world-prop_id"><code>World.prop_id</code></a>). A quick population count — how many enemies are alive, how many pickups remain — without writing a query loop.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-prop"><code class="pname">prop</code><span class="pdesc">a property id (from <code>World.prop_id("Name")</code>)</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
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property Enemy { hp: int = 0 }
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model Slime { Enemy }
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entry {
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spawn Slime { Enemy { hp: 3 } }
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spawn Slime { Enemy { hp: 3 } }
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let E = World.prop_id("Enemy")
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print(Query.count(E)) # 2
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}
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}</pre></div>
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