Math.max()
to get the longest array in the arguments.Array.from()
to create an array with appropriate length and a mapping function to create array of grouped elements.undefined
is used where no value could be found.const zipWith = (...array) => {
const fn =
typeof array[array.length - 1] === 'function' ? array.pop() : undefined;
return Array.from({ length: Math.max(...array.map(a => a.length)) }, (_, i) =>
fn ? fn(...array.map(a => a[i])) : array.map(a => a[i])
);
};
zipWith([1, 2], [10, 20], [100, 200], (a, b, c) => a + b + c); // [111, 222] zipWith( [1, 2, 3], [10, 20], [100, 200], (a, b, c) => (a != null ? a : 'a') + (b != null ? b : 'b') + (c != null ? c : 'c') ); // [111, 222, '3bc']
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