Just wanted to play around with creating addition and subtraction methods without using + and -

Addition&Subtraction without + or -

/*
  Just wanted to play around with creating addition and subtraction methods without using + and -
  @author: David Brear
  @date: 2015-05-11
*/

var add = function (x, y) {
    while (y !== 0) {
        var carry = x & y;
        x = x ^ y;
        y = carry << 1;
    }
    return x;
};
var subtract = function (x, y) {
    var negy = add(~y, 1);
    return add(x, negy);
};