TanTan
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49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
/** Returns true if element right is in the set of left */
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// prettier-ignore
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export function SetIncludes(T, S) {
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return T.includes(S);
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}
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/** Returns true if left is a subset of right */
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export function SetIsSubset(T, S) {
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return T.every((L) => SetIncludes(S, L));
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}
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/** Returns a distinct set of elements */
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export function SetDistinct(T) {
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return [...new Set(T)];
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}
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/** Returns the Intersect of the given sets */
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export function SetIntersect(T, S) {
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return T.filter((L) => S.includes(L));
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}
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/** Returns the Union of the given sets */
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export function SetUnion(T, S) {
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return [...T, ...S];
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}
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/** Returns the Complement by omitting elements in T that are in S */
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// prettier-ignore
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export function SetComplement(T, S) {
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return T.filter(L => !S.includes(L));
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}
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// prettier-ignore
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function SetIntersectManyResolve(T, Init) {
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return T.reduce((Acc, L) => {
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return SetIntersect(Acc, L);
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}, Init);
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}
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// prettier-ignore
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export function SetIntersectMany(T) {
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return (T.length === 1
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? T[0]
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// Use left to initialize the accumulator for resolve
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: T.length > 1
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? SetIntersectManyResolve(T.slice(1), T[0])
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: []);
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}
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/** Returns the Union of multiple sets */
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export function SetUnionMany(T) {
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const Acc = [];
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for (const L of T)
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Acc.push(...L);
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return Acc;
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}
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