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zip.ts
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zip.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/**
* Builds 2-tuples of elements from the given array with matching indices, stopping when the smaller array's end is reached
*
* Example:
*
* ```ts
* import { zip } from "https://deno.land/std@$STD_VERSION/collections/mod.ts";
* import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts";
*
* const numbers = [ 1, 2, 3, 4 ]
* const letters = [ 'a', 'b', 'c', 'd' ]
* const pairs = zip(numbers, letters)
*
* assertEquals(pairs, [
* [ 1, 'a' ],
* [ 2, 'b' ],
* [ 3, 'c' ],
* [ 4, 'd' ],
* ])
* ```
*/
export function zip<T, U>(
array: readonly T[],
withArray: readonly U[],
): [T, U][] {
const returnLength = Math.min(array.length, withArray.length);
const ret = new Array<[T, U]>(returnLength);
for (let i = 0; i < returnLength; i += 1) {
ret[i] = [array[i], withArray[i]];
}
return ret;
}