How to get the product of two integers without using *

Question

I am trying to figure out ways to get the products of two integers without using * in my solution. The closest I got was is

/*Example: 2,5 output ====> 10 */
/*Example: 10,5 output ====> 50 */

const productOfTwoInt = (int,int2) => {
  var data1 = 0;
  var data2 = 0;

  var result;
  var result2;  

  for(var x = 0; x <= int; x++) {
      result = x += data1
      console.log(result)
  }

  for(var j = 0; j <= int2; j++) {
      result2 = j += data2
  }

  return result + result2    
}

console.log(productOfTwoInt(3,5))

Answer 1

You could take some bit shifting, known as ancient egyptian multiplication or russian multiplication.

  a     b     p   comment
----  ----  ----  ----------------------------------
  6     8     0   skip, because a is even
  3    16    16   add 16 to p, because a is odd
  1    32    48   add 32 to p, because a is odd
  0    64    48   stop iteration, because a is zero

function product(a, b) {
    var p = 0;
    while (a) {
        p += (a & 1) && b;
        a >>= 1;
        b <<= 1;
    }
    return p;
}

console.log(product(6, 8)); // 48