Function multiplication

javascript/0043-multiply-strings.js:27–35

(num1, num2, buffer)

};

var multiplication = (num1, num2, buffer) => {
    for (let i = num1.length - 1; 0 <= i; i--) {
        /* Time O(N) */
        for (let j = num2.length - 1; 0 <= j; j--) {
            /* Time O(M) */
            update(num1, i, num2, j, buffer); /* Space O(N + M) */
        }
    }
};

var removeLeadingZero = (buffer) => {
    const isLeadZero = buffer[0] === 0;