How Hardware multiplies unsigned integers

multiply.js

function multiply(multiplicant, multiplier){

	var product = 0;

	for (var i = 0; i < 32; i++){
		product += (multiplier & 1) ? multiplicant : 0;
		multiplicant <<= 1;
		multiplier >>= 1;
	}

	return product;
}

console.log(multiply(2, 3));
console.log(multiply(2, 4));
console.log(multiply(2, 5));
console.log(multiply(30, 5));