238-Product-of-Array-Except-Self.js

/**
 * @param {number[]} nums
 * @return {number[]}
 */
var productExceptSelf = function (nums) {
    const res = [];

    let product = 1;

    for (let i = 0; i < nums.length; i++) {
        res[i] = product;
        product *= nums[i];
    }
    product = 1;
    for (let j = nums.length - 1; j >= 0; j--) {
        res[j] *= product;
        product *= nums[j];
    }

    return res;
};