Question

Suppose I have a Javascript object (the curly braces indicate it is so):

{
   a: function (something) {
      return something*2;
   },
   b: function () {
      var c = this.a(2);      //Does not work. Why?
      return c;
   }
}

What is the workaround to this?

Answer 1

It not work because when you access the method b it context isn’t the instance from object that you made, it will try to search in the binded context or in window object.

var x = {
   a: function (something) {
      return something*2;
   },
   b: function () {
      var c = x.a(2);      //Does not work. Why?
      return c;
   }
}

This way you are using the x as context to access the method a.

Or you can use a new operator to create your object and the method as it prototype or direct method.

When you do it, the result will be:

var x = function() {
    return {
       a: function (something) {
          return something*2;
       },
       b: function () {
          var c = this.a(2);      //Does not work. Why?
          return c;
       }
    }
}

It will make you lose the prototype from x, when you make a new instance, but your code will work.

Example:

var y = new x();
console.log(y.b());