Nodejs Number Add add(x)

Method Source Code

Number.prototype.add = function(x){
  return this + x;
};

Number.prototype.sub = function(x){
  return this - x;
};

console.log("***>(4).add(3).sub(1):", (4).add(3).sub(1));

Related

1. add(n)

   Number.prototype.add = function(n){
     return this+n
   Number.prototype.subtract = function(n){
     return this-n
   Number.prototype.multiply = function(n){
     return this*n
   Number.prototype.divide = function(n){
     return this/n
   Number.prototype.square = function(n){
     var _ = this;
     return Math.pow(_,2)
   Number.prototype.add      = function(n){ return this+n }
   Number.prototype.subtract = function(n){ return this-n }
   Number.prototype.multiply = function(n){ return this*n }
   Number.prototype.divide   = function(n){ return this/n }
   Number.prototype.square   = function(){ return this*this }
   

2. add(n) return this+n }

   Number.prototype.add      = function(n){ return this+n }
   Number.prototype.subtract = function(n){ return this-n }
   Number.prototype.multiply = function(n){ return this*n }
   Number.prototype.divide   = function(n){ return this/n }
   Number.prototype.square   = function(){ return this*this }
   

3. add(num)

   Number.prototype.add = function(num) {
     return this + num;
   var n = 5;
   assert(n.add(3) == 8, 'It works when the number is in a variable.');
   assert((5).add(3) == 8, 'Also works if a number is wrapped in parentheses.');
   assert(5.add(3) == 8, 'What about a simple literal?');
   

4. add(num)

   Number.prototype.add = function(num)
       return this+num;
   };
   describe("6.13", function () {
       it("It works when the number is in a variable.", function () {
            expect(n.add(3)).toEqual(8);
       });
       it("It works when the number is in a parentheses.", function () {
   ...
   

5. add(num)

   Number.prototype.add = function (num) {
     return this + num;
   };
   Number.prototype.subtract = function (num) {
     return this - num;
   };
   Number.prototype.multiply = function (num) {
     return this * num;
   };
   ...