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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
/** * Builds two separate arrays from the given array of 2-tuples, with the first returned array holding all first * tuple elements and the second one holding all the second elements * * Example: * * ```typescript * const parents = [ *     [ 'Maria', 'Jeff' ], *     [ 'Anna', 'Kim' ], *     [ 'John', 'Leroy' ], * ] * const [ moms, dads ] = unzip(parents) * * console.assert(moms === [ 'Maria', 'Anna', 'John' ]) * console.assert(moms === [ 'Jeff', 'Kim', 'Leroy' ]) * ``` */export function unzip<T, U>(pairs: Array<[T, U]>): [Array<T>, Array<U>] {  const { length } = pairs;  const ret: [Array<T>, Array<U>] = [    new Array(length),    new Array(length),  ];
  pairs.forEach(([first, second], index) => {    ret[0][index] = first;    ret[1][index] = second;  });
  return ret;}