function sum(arrays) {
return arrays.reduce((acc, array) => acc.map((sum, i) => sum + array[i]), new Array(arrays[0].length).fill(0));
}
const arrays = [
[4, 6, 3, 2],
[1, 4, 7, 9],
[4, 6, 3, 2],
[1, 4, 7, 9]
];
const result = sum(arrays);
console.log(result);
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