Math.max()
, Function.prototype.apply()
to get the longest subarray in the array, Array.prototype.map()
to make each element an array.Array.prototype.reduce()
and Array.prototype.forEach()
to map grouped values to individual arrays.Array.prototype.map()
and the spread operator (...
) to apply fn
to each individual group of elements.const unzipWith = (arr, fn) => arr .reduce( (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc), Array.from({ length: Math.max(...arr.map(x => x.length)) }).map(x => []) ) .map(val => fn(...val));
unzipWith( [ [1, 10, 100], [2, 20, 200], ], (...args) => args.reduce((acc, v) => acc + v, 0) ); // [3, 30, 300]
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