44 lines
1 KiB
TypeScript
44 lines
1 KiB
TypeScript
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/** Returns a tuple consisting of a running index starting from 0, and the item of the iterable */
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export function* enumerate<T>(iterable: Iterable<T>) {
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let index = 0;
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for (const item of iterable) {
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yield [index++, item] as [number, T];
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}
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}
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/** Returns adjacent pairs from iterable */
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export function* pairs<T>(iterable: Iterable<T>) {
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let first;
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let second;
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for (const [index, item] of enumerate(iterable)) {
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[first, second] = [second, item];
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if (index >= 1) {
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yield [first, second] as [T, T];
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}
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}
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}
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/**
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Returns true if all sets are equal
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@param sets set to compare
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@returns true if all sets are the same size and have the same elements
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*/
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export function setEquals<T>(...sets: Set<T>[]) {
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if (sets.length < 2) {
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throw TypeError("At least two sets must be passed to setEquals");
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}
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const ref = sets[0];
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const rest = sets.slice(1);
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if (rest.some(set => set.size !== ref.size)) {
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return false;
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}
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for (const set of rest) {
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for (const el of set) {
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if (!ref.has(el)) {
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return false;
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}
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}
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}
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return true;
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}
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