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CHANGELOG.md

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Jecs Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

  • [world]:

    • 16% faster world:get

  • [typescript]

    • Fixed Entity type to default to undefined | unknown instead of just undefined

  • [query]:

    • Fixed bug where world:clear did not invoke jecs.OnRemove hooks
    • Changed query.__iter to drain on iteration
      • It will initialize once wherever you left iteration off at last time
    • Changed query:iter to restart the iterator
    • Removed query:drain and query:next
      • If you want to get individual results outside of a for-loop, you need to call query:iter to initialize the iterator and then call the iterator function manually
      local it = world:query(A, B, C):iter()
local entity, a, b, c = it()
entity, a, b, c = it() -- get next results

  • [world

    • Fixed a bug with world:clear not invoking jecs.OnRemove hooks

  • [typescript]:

    • Changed pair to accept generics
    • Improved handling of Tags

[0.3.2] - 2024-10-01

  • [world]:
    • Changed world:cleanup to traverse a header type for graph edges. (Edit)
    • Fixed a regression that occurred when you call world:set following a world:remove using the same component
    • Remove explicit error in JECS_DEBUG for world:target when not applying an index parameter
  • [typescript] :
    • Fixed world.set with NoInfer

[0.3.1] - 2024-10-01

  • [world]:
    • Added an index parameter to world:target
    • Added a way to change the components limit via _G.JECS_HI_COMPONENT_ID
      • Set it to whatever number you want but try to make it as close to the number of components you will use as possible
      • Make sure to set this before importing jecs or else it will not work
    • Added debug mode, enable via setting _G.JECS_DEBUG to true
      • Make sure to set this before importing jecs or else it will not work
    • Added world:cleanup which is called to cleanup empty archetypes manually
    • Changed world:delete to delete archetypes that are dependent on the passed entity
    • Changed world:delete to delete entity's children before the entity to prevent cycles
  • [query]:
    • Fixed the iterator to not drain by default
  • [typescript]
    • Fixed entry point of the package.json file to be src rather than src/init
    • Fixed query.next returning a query object whereas it would be expected to return a tuple containing the entity and the corresponding component values
    • Exported query.archetypes
    • Changed pair to return a number instead of an entity
      • Preventing direct usage of a pair as an entity while still allowing it to be used as a component
    • Exported built-in components ChildOf and Name
    • Exported world.parent

[0.2.10] - 2024-09-07

  • [world]:
    • Improved performance for hooks
    • Changed world:set to be idempotent when setting tags
  • [traits]:
    • Added cleanup condition jecs.OnDelete for when the entity or component is deleted
    • Added cleanup action jecs.Remove which removes instances of the specified (component) id from all entities
      • This is the default cleanup action
    • Added component trait jecs.Tag which allows for zero-cost components used as tags
      • Setting data to a component with this trait will do nothing
  • [luau]:
    • Exported world:contains()
    • Exported query:drain()
    • Exported Query
    • Improved types for the hook OnAdd, OnSet, OnRemove
    • Changed functions to accept any ID including pairs in type parameters
      • Applies to world:add(), world:set(), world:remove(), world:get(), world:has() and world:query()
      • New exported type Id<T = nil> = Entity<T> | Pair
    • Changed world:contains() to return a boolean instead of an entity which may or may not exist
    • Fixed world:has() to take the correct parameters

0.2.2 - 2024-07-07

Added

  • Added query:replace(function(...T) return ...U end) for replacing components in place
    • Method is fast pathed to replace the data to the components for each corresponding entity

Changed

  • Iterator now goes backwards instead to prevent common cases of iterator invalidation

0.2.1 - 2024-07-06

Added

  • Added jecs.Component built-in component which will be added to ids created with world:component().
    • Used to find every component id with `query(jecs.Component)

0.2.0 - 2024-07-03

Added

  • Added world:parent(entity) and jecs.ChildOf respectively as first class citizen for building parent-child relationships.
    • Give a parent to an entity with world:add($source, pair(ChildOf, $target))
    • Use world:parent(entity) to find the target of the relationship
  • Added user-facing Luau types

Changed

  • Improved iteration speeds 20-40% by manually indexing rather than using next() 😱

0.1.1 - 2024-05-19

Added

  • Added world:clear(entity) for removing the components to the corresponding entity
  • Added Typescript Types

0.1.0 - 2024-05-13

Changed

  • Optimized iterator

0.1.0-rc.6 - 2024-05-13

Added

  • Added a jecs.Wildcard term
    • it lets you query any partially matched pairs

0.1.0-rc.5 - 2024-05-10

Added

  • Added Entity relationships for creating logical connections between entities
  • Added world:__iter method which allows for iteration over the whole world to get every entity
    • used for reconciling whole worlds such as via replication, saving/loading, etc
  • Added world:add(entity, component) which adds a component to the entity
    • it is an idempotent function, so calling it twice and in any order should be fine

Fixed

  • Fixed component overriding when in disorder
    • Previously setting the components in different order results in it overriding component data because it incorrectly mapped the index of the column. So it took the index from the source archetype rather than the destination archetype

[0.0.0-prototype.rc.3] - 2024-05-01

Added

  • Added observers
  • Added an arm to query query:without() for chaining invariants.

Changed

  • Separates ranges for components and entity IDs.

    • IDs created with world:component() will promote array lookups rather than map lookups in the componentIndex which is a significant boost

  • No longer caches the column pointers directly and instead the column indices which stay persistent even when data is reallocated during swap-removals

    • This was an issue with the iterator being invalidated when you move an entity to a different archetype.

Fixedhttps://github.com/Ukendio/jecs/releases/tag/v0.0.0-prototype.rc.3

  • Fixed a bug where changing an existing component would be slow because it was always appending changing the row of the entity record
    • The fix dramatically improves times where it is basically down to just the speed of setting a field in a table

0.0.0-prototype.rc.2 - 2024-04-26

Changed

  • Optimized the creation of the query

    • It will now finds the smallest archetype map to iterate over

  • Optimized the query iterator

    • It will now populates iterator with columns for faster indexing

  • Renamed the insertion method from world:add to world:set to better reflect what it does.

0.0.0-prototype.rc.2 - 2024-04-23

  • Initial release