productNumber.js

const productNumber = (num) => {

    let products = [num.length];

    //forward pass
    let forwardMultiple = 1;
    for (let i = 0; i < num.length; i++) {
        products[i] = forwardMultiple; 
        forwardMultiple *= num[i];
    }
    //backword pass
    let backwordMultiple = 1;
    for (let i = num.length - 1; i >= 0; i--) {
        products[i] *= backwordMultiple;
        backwordMultiple *= num[i];

    }
    return products;
}
console.log(productNumber([4, 5, 10, 2]))

@meekg33k Thanks. I really appreciate you