mirror of
https://github.com/meteor/meteor.git
synced 2026-05-02 03:01:46 -04:00
27 lines
677 B
JavaScript
27 lines
677 B
JavaScript
import invariant from 'invariant'
|
|
|
|
// Set -> Set -> Set
|
|
export function difference (a, b) {
|
|
invariant(!!a, 'difference: Set a is not defined')
|
|
invariant(!!b, 'difference: Set b is not defined')
|
|
return new Set(
|
|
[...a].filter(x => !b.has(x))
|
|
)
|
|
}
|
|
|
|
// Set -> Set -> Set
|
|
export function union (a, b) {
|
|
invariant(!!a, 'union: Set a is not defined')
|
|
invariant(!!b, 'union: Set b is not defined')
|
|
return new Set([...a, ...b])
|
|
}
|
|
|
|
// Set -> Set -> Set
|
|
export function intersection (a, b) {
|
|
invariant(!!a, 'intersection: Set a is not defined')
|
|
invariant(!!b, 'intersection: Set b is not defined')
|
|
return new Set(
|
|
[...a].filter(element => b.has(element))
|
|
)
|
|
}
|