Collections

Lists

values: list[int] = [1, 2, 3]
values[0] = 5
values.append(8)
values.insert(1, 6)
last: int = values.remove()
first: int = values.remove(0)

Use items[index] for dynamic indexing. Indexed string and list elements can be read, replaced, or removed and returned.

List operations

+ joins two compatible lists. len(values) returns their length. list(value) converts a compatible collection, and nested types such as list[set[int]] remain typed.

Sets

all: set[int] = left | right
common: set[int] = left & right

| is union and & is intersection. The same operators work for entity sets, which are represented by tags rather than storage iteration.

Set storage

Primitive sets use a JSON object whose keys point to their values with 1b membership markers. Entity sets use one generated tag applied to every member.

Iteration

Lists iterate by ordered index. Primitive sets iterate over their stored keys. Entity sets iterate by executing as every entity with the set tag.