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<!doctype html>
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<title>self — Ludic</title>
<meta name="description" content="The model instance currently bound by the enclosing query loop.">
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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#ecs">Entities &amp; the ECS</a> <span>›</span> <span class="here">self</span></div>
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<h1 id="top">self</h1>
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<code class="sig">self()</code>
<div class="desc"><p><code>self()</code> yields the model instance currently being visited by the innermost enclosing <code>query</code> loop, as an <code>entity</code> handle. It is how a handler names "the instance this pass is about" — most often to <code>despawn self()</code>, to <code>attach</code>/<code>detach</code> a property <code>on self()</code>, or to pass the current instance to a function. Because it depends on the active query iteration, <code>self()</code> is only meaningful inside a <code>for (…) in query […]</code> loop (or a <code>@Queries</code> handler, which desugars to one). Outside any query it has no instance to refer to.</p></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Reaper {
property Position { column: int = 0, row: int = 0 }
property Health { current: int = 100, maximum: int = 100 }
model Enemy { Position, Health }
handler Boot phase Start {
spawn Grunt { Position { column: 1, row: 1 }; Health { current: 0 } }
}
handler RemoveDefeated phase LateUpdate {
for (health) in query [Health, {Enemy}] {
if health.current &lt;= 0 { despawn self() }
}
}
}</pre></div>
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