unzip

Creates an array of arrays, ungrouping the elements in an array produced by [zip].

Use Math.max.apply() to get the longest subarray in the array, Array.prototype.map() to make each element an array. Use Array.prototype.reduce() and Array.prototype.forEach() to map grouped values to individual arrays.

typescript

const unzip = (arr: any[], size = 0) => {
  return arr.reduce(
    (acc, val) => (val.forEach((v: any, i: number) => acc[i].push(v)), acc),
    Array.from({
      length: size || Math.max(...arr.map((x) => x.length)),
    }).map(() => [])
  );
};

typescript

unzip([
  ["a", 1, true],
  ["b", 2, false],
]); // [['a', 'b'], [1, 2], [true, false]]
unzip([
  ["a", 1, true],
  ["b", 2],
]); // [['a', 'b'], [1, 2], [true]]
unzip(
  [
    ["a", 1, true],
    ["b", 2, false],
  ],
  3
); // [ ["a", "b"], [1, 2], [true, false], ]