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Add type-safe set functions

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Xevion
2023-02-24 20:37:53 -06:00
parent 9aea53aef7
commit c94ce8c745
1 changed files with 13 additions and 0 deletions
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src/sets.ts Normal file
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export const union = <T>(a: Set<T>, b: Set<T>) => new Set([...a, ...b]);
export const intersection = <T>(a: Set<T>, b: Set<T>) =>
new Set([...a].filter((x) => b.has(x)));
export const difference = <T>(a: Set<T>, b: Set<T>) =>
new Set([...a].filter((x) => !b.has(x)));
export const symmetric = <T>(a: Set<T>, b: Set<T>) =>
union(difference(a, b), difference(b, a));
export const isSubsetOf = <T>(a: Set<T>, b: Set<T>) =>
[...b].every((x) => a.has(x));
export const isSupersetOf = <T>(a: Set<T>, b: Set<T>) =>
[...a].every((x) => b.has(x));
export const isDisjointFrom = <T>(a: Set<T>, b: Set<T>) =>
!intersection(a, b).size;