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docs/learn/concepts/queries.md
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@ -24,6 +24,7 @@ for _ in world:query(Position, Velocity) do end
```typescript [typescript] ```typescript [typescript]
for (const [_] of world.query(Position, Velocity)) {} for (const [_] of world.query(Position, Velocity)) {}
``` ```
:::
### Components ### Components
A component is any single ID that can be added to an entity. This includes tags and regular entities, which are IDs that do not have the builtin `Component` component. To match a query, an entity must have all the requested components. An example: A component is any single ID that can be added to an entity. This includes tags and regular entities, which are IDs that do not have the builtin `Component` component. To match a query, an entity must have all the requested components. An example:
@ -71,6 +72,7 @@ const Likes = world.entity()
const bob = world.entity() const bob = world.entity()
for (const [_] of world.query(pair(Likes, bob))) {} for (const [_] of world.query(pair(Likes, bob))) {}
``` ```
:::
When a query pair contains a wildcard, the `world:target()` function can be used to determine the target of the pair element that matched the query: When a query pair contains a wildcard, the `world:target()` function can be used to determine the target of the pair element that matched the query:
@ -87,6 +89,7 @@ for (const [_] of world.query(pair(Likes, jecs.Wildcard))) {
print(`entity ${getName(id)} likes ${getName(world.target(id, Likes))}`) print(`entity ${getName(id)} likes ${getName(world.target(id, Likes))}`)
} }
``` ```
:::
### Filters ### Filters
Filters are extensions to queries which allow you to select entities from a more complex pattern but you don't actually care about the component values. Filters are extensions to queries which allow you to select entities from a more complex pattern but you don't actually care about the component values.