Javascript Number plus(num)

Number.prototype.plus = function(num) {
 return this + num
};
Number.prototype.minus = function(num) {
 return this - num
};
Number.prototype.multi = function(num) {
 return this * num
}

debug((5).plus(3).minus(6))//from www . j  ava2 s  .c  om
debug((5).multi((3).plus(2)))
debug(6..multi(2..plus(2)))

/**
 * var a = add(2)(3)(5)
 */

function add(x) {
 return function(y) {
  return function(z) {
   return x + y + z
  }
 }
}

debug(add(2) + '\n\n')
debug(add(2)(3) + '\n\n')
debug(add(2)(3)(5) + '\n\n')