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<title>Query — Ludic</title>
<meta name="description" content="Spatial and set queries over the live entities that carry a property, built on the World reflection ABI.">
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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> <span class="here">Query</span></div>
<div class="item-head"><span class="kind-badge kind-namespace">namespace</span><h1 id="top">Query</h1></div>
<p class="ns-blurb">Spatial and set queries over the live entities that carry a property, built on the <a href="world"><code>World</code></a> reflection ABI. <a href="query-count"><code>Query.count</code></a> and <a href="query-first"><code>Query.first</code></a> ask how many bearers there are and which is first; <a href="query-nearest"><code>Query.nearest</code></a> and <a href="query-within"><code>Query.within</code></a> add a position — read from a coordinate property's two int fields — to find the closest entity to a point or every entity inside a radius. A property id comes from <a href="world-prop_id"><code>World.prop_id</code></a> and a field id from <a href="world-field_id"><code>World.field_id</code></a>. Everything is integer and deterministic: the same world reproduces the same answers, entity order included, every run. The scan is linear over the entity table — ample for the entity counts Ludic targets — and a game that uses <code>Query.*</code> gets the reflection ABI emitted automatically, no <code>@event</code> required.</p>
<div class="ns-methods"><a class="ns-method" href="query-count.html"><code class="nm-sig">Query.count(prop) -&gt; int</code><span class="nm-tip">How many live entities carry a property.</span></a><a class="ns-method" href="query-first.html"><code class="nm-sig">Query.first(prop) -&gt; int</code><span class="nm-tip">The lowest-id live entity carrying a property, or -1.</span></a><a class="ns-method" href="query-nearest.html"><code class="nm-sig">Query.nearest(prop, pos, x_field, y_field, x, y) -&gt; int</code><span class="nm-tip">The bearer of prop closest to a point, by squared distance.</span></a><a class="ns-method" href="query-within.html"><code class="nm-sig">Query.within(prop, pos, x, y, radius, x_field, y_field) -&gt; []int</code><span class="nm-tip">Every bearer of prop inside a radius of a point.</span></a></div>
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