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Out with the old
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# World
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A World contains all ECS data
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Games can have multiple worlds, although typically only one is necessary. These worlds are isolated from each other, meaning they donot share the same entities nor component IDs.
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---
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# Entity
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An unique id.
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Entities consist out of a number unique to the entity in the lower 32 bits, and a counter used to track entity liveliness in the upper 32 bits. When an id is recycled, its generation count is increased. This causes recycled ids to be very large (>4 billion), which is normal.
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---
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# QueryIter
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A result from the `World:query` function.
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Queries are used to iterate over entities that match against the set collection of components.
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Calling it in a loop will allow iteration over the results.
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```lua
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for id, enemy, charge, model in world:query(Enemy, Charge, Model) do
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-- Do something
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end
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```
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### QueryIter.without
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QueryIter.without(iter: QueryIter
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...: [Entity](#Entity)): QueryIter
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Create a new Query Iterator from the filter
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#### Parameters
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world The world.
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... The collection of components to filter archetypes against.
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#### Returns
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The new query iterator.
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# World
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### World.new
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World.new(): [World](../api-types.md#World)
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Create a new world.
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#### Returns
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A new world
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---
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### World.entity
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World.entity(world: [World](../api-types.md#World)): [Entity](../api-types.md#Entity)
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Creates an entity in the world.
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#### Returns
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A new entiity id
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---
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### World.target
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World.target(world: [World](../api-types.md#World),
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entity: [Entity](../api-types.md#Entity),
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rel: [Entity](../api-types.md#Entity)): [Entity](../api-types.md#Entity)
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Get the target of a relationship.
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This will return a target (second element of a pair) of the entity for the specified relationship.
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#### Parameters
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world The world.
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entity The entity.
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rel The relationship between the entity and the target.
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#### Returns
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The first target for the relationship
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---
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### World.add
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World.add(world: [World](../api-types.md#World),
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entity: [Entity](../api-types.md#Entity),
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id: [Entity](../api-types.md#Entity)): [Entity](..#api-types.md#Entity)
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Add a (component) id to an entity.
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This operation adds a single (component) id to an entity.
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If the entity already has the id, this operation will have no side effects.
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#### Parameters
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world The world.
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entity The entity.
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id The id to add.
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---
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### World.remove
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World.remove(world: [World](../api-types#World),
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entity: [Entity](../api-types#Entity),
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id: [Entity](../api-types#Entity)): [Entity](../api-types#Entity)
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Remove a (component) id to an entity.
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This operation removes a single (component) id to an entity.
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If the entity already has the id, this operation will have no side effects.
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#### Parameters
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world The world.
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entity The entity.
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id The id to add.
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---
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### World.get
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World.get(world: [World](../api-types.md#World),
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entity: [Entity](../api-types.md#Entity),
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id: [Entity](../api-types.md#Entity)): any
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Gets the component data.
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#### Parameters
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world The world.
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entity The entity.
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id The id of component to get.
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#### Returns
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The component data, nil if the entity does not have the componnet.
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---
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### World.set
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World.set(world: [World](../api-types.md#World),
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entity: [Entity](../api-types.md#Entity),
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id: [Entity](../api-types.md#Entity)
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data: any)
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Set the value of a component.
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#### Parameters
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world The world.
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entity The entity.
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id The id of the componment set.
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data The data to the component.
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---
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### World.query
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World.query(world: [World](../api-types.md#World),
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...: [Entity](../api-types.mdEntity)): [QueryIter](../api-types.md#QueryIter)
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Create a QueryIter from the list of filters.
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#### Parameters
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world The world.
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... The collection of components to match entities against.
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#### Returns
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The query iterator.
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---
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# Pair
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### pair
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pair(first: [Entity](../api-types#Entity), second: [Entity](../api-types#Entity)): [Entity](../api-types#Entity)
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Creates a composite key.
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#### Parameters
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first The first element.
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second The second element.
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#### Returns
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The pair of the two elements
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---
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### IS_PAIR
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jecs.IS_PAIR(id: [Entity](../api-types#Entity)): boolean
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Creates a composite key.
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#### Parameters
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id The id to check.
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#### Returns
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If id is a pair.
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---
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# Constants
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### OnAdd
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---
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### OnRemove
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---
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### Rest
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---
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### OnSet
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---
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### Wildcard
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Matches any id, returns all matches.
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@ -1,19 +0,0 @@
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# Getting Started
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This section will provide a walk through setting up your development environment and a quick overview of the different features and concepts in Jecs with short examples.
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## Installing Jecs
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To use Jecs, you will need to add the library to your project's source folder.
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## Installing as standalone
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Head over to the [Releases](https://github.com/ukendio/jecs/releases/latest) page and install the rbxm file.
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## Installing with Wally
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Jecs is available as a package on [wally.run](https://wally.run/package/ukendio/jecs)
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Add it to your project's Wally.toml like this:
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```toml
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[dependencies]
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jecs = "0.1.0" # Make sure this is the latest version
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```
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