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35 lines
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2.1 KiB
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<title>Reflect.has — Ludic</title>
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<meta name="description" content="Does an entity 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-reflect.html">Reflect</a> <span>›</span> <span class="here">Reflect.has</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">Reflect.has</h1>
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</div>
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<code class="sig">Reflect.has(entity, prop) -> bool</code>
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<div class="desc"><p>Returns whether <code>entity</code> carries property <code>prop</code>. A generic walker checks it before reading a component's fields, so it visits only the components an entity actually has.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-entity"><code class="pname">entity</code><span class="pdesc">the entity to test</span></div><div class="param" id="param-prop"><code class="pname">prop</code><span class="pdesc">a property id (from <a href="reflect-prop"><code>Reflect.prop</code></a>)</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
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property Health { hp: int = 0 }
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model Unit { Health }
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entry {
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spawn Unit { Health { hp: 7 } }
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if Reflect.has(0, Reflect.prop("Health")) { print(1) }
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}
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}</pre></div>
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