How do I assign the return value from a method to another object property in Javascript? -

I am objectively partaking some old code in JavaScript, and I'm afraid that I know a little bit bugger How is that properties defined, and I know how to define methods, but what if I want to assign return value to any method as property?

I have supplied the code from Chrome's error message console. I can not see what I am doing, but the console is telling me that I am either trying to do something in the global scope, or anything or nothing. Here it is:

Code:

  var testobj = {a: 2, b: 4, c: function () {return.a * this.b; }, D: this.c (), // OK, got it, it is trying to call it with a global radius Fine. E: function () {if (this.d) {console.log ("success"); Console.log (this.d); } And {console.log ("Error"); }}}   
 Error:  
  typeError: There is no way in object [object global] 'c'   < P> New code:  
  var testobj = {a: 2, b: 4, c: function () {this.a * this.b return]; }, D: testobj.c (), // But if I change it like this, it still does not work. what gives? E: function () {if (this.d) {console.log ("success"); Console.log (this.d); } And {console.log ("Error"); }}}   
 New error:  
  typeError: can not call 'c' the undefined method   
 Anybody can see what I am doing?   
 
 
 You can fix this by using:  
  var Testobj = {a: 2, b: 4, c: function () {return.a * this.b; }, D: function () {return.c (); }, E: function () {if (this.d) {console.log ("SUCCESS"); Console.log (this.d); } And {console.log ("Error"); }}}   
 The reason for this is because when you  D: this.c () ,  does  actually have a global object When creating your  testobj , the radius is a global object, so  this  is a global object.  
 If you use  
  d: function () {this.c (); }   
 You are just setting  testobj.c  for a certain function. When you call  this  that function is evaluated  d  so when you call  d , it will see the scope You will see that this scope is  testobj . And  testobj  has a  c  function, this wall calls and returns it.  
 I have kept it to see it in implementation. / P>