Set Helpers

Utility functions for working with set operations.

Functions

Function	Description
countBy	Groups the values of a Set by a derived key and counts how many fall into each group.
difference	native JS Set.prototype.difference() (ES2025 (Set methods))
filter	Creates a new Set containing only the values for which the predicate returns true.
forEach	native JS Set.prototype.forEach((value, value2, set) => ...) (ES2015)
groupBy	native JS Map.groupBy(set.values(), fn) (ES2024)
intersection	native JS Set.prototype.intersection() (ES2025 (Set methods))
map	Creates a new Set with each value transformed by a function.
map / filter	native JS new Set(set.values().map(fn)) / new Set(set.values().filter(fn)) (ES2025 (Iterator Helpers))
reduce / some / every / find	native JS set.values().reduce(fn, init) / .some(fn) / .every(fn) / .find(fn) (ES2025 (Iterator Helpers))
symmetricDifference	native JS Set.prototype.symmetricDifference() (ES2025 (Set methods))
toMapByKey	Builds a Map from a Set, keyed by a derived key.
union	native JS Set.prototype.union() (ES2025 (Set methods))