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39 lines
1.4 KiB
TypeScript
39 lines
1.4 KiB
TypeScript
/**
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* Copyright (c) OpenLens Authors. All rights reserved.
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* Licensed under MIT License. See LICENSE in root directory for more information.
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*/
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import * as array from "../utils/array";
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/**
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* A strict N-tuple of type T
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*/
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export type Tuple<T, N extends number> = N extends N ? number extends N ? T[] : _TupleOf<T, N, []> : never;
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type _TupleOf<T, N extends number, R extends unknown[]> = R["length"] extends N ? R : _TupleOf<T, N, [T, ...R]>;
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/**
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* Iterates over `sources` yielding full tuples until one of the tuple arrays
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* is empty. Then it returns a tuple with the rest of each of tuples
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* @param sources The source arrays
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* @yields A tuple of the next element from each of the sources
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* @returns The tuple of all the sources as soon as at least one of the sources is exausted
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*/
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export function* zip<T, N extends number>(...sources: Tuple<T[], N>): Iterator<Tuple<T, N>, Tuple<T[], N>> {
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const maxSafeLength = Math.min(...sources.map(source => source.length));
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for (let i = 0; i < maxSafeLength; i += 1) {
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yield sources.map(source => source[i]) as Tuple<T, N>;
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}
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return sources.map(source => source.slice(maxSafeLength)) as Tuple<T[], N>;
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}
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/**
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* Returns a `length` tuple filled with copies of `value`
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* @param length The size of the tuple
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* @param value The value for each of the tuple entries
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*/
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export function filled<T, L extends number>(length: L, value: T): Tuple<T, L> {
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return array.filled(length, value) as Tuple<T, L>;
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}
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