ECS Queries

ECS Queries

World.query() returns a fluent Query.

Filters

• .with(type...)
• .without(type...)
• .optional(type)
• .changed(type)

Deterministic Iteration

When with is present, candidates are seeded by first with store and yielded in sorted entity index order.

Changed Semantics

.changed(type) compares component changedAt to query's previous iteration tick.

Behavior:

1. first iteration includes matching changed components
2. second iteration excludes unchanged components
3. subsequent writes re-include entities

Result Shape

Each item includes:

• entity
• components map keyed by requested types