Bitwise addition

add.js

// Fuck the addition operator. Real programmers work in binary!
function add(a, b) {
  // XOR to get the sum of the bits
  var sum = a ^ b;

  // "Carry" bits are common to both numbers
  var carry = (a & b) << 1;

  if (sum & carry) {
    // Rinse and repeat until there are no leftover bits
    return add(sum, carry);
  } else {
    return sum ^ carry;
  }
}


/*
> add(5, 6)
11
> add(5, 10)
15
> add(-1, 40)
39
> add(1, 9)
10
*/

@wildlyinaccurate thank you. I tried to split the input numbers into smaller parts to be able to sum larger numbers but it computes incorrectly.