5 Comments on “Which code should you use?”

1. Valikhan says:

   August 2, 2015 at 12:33 pm

   I think the correct answer is B, coz in option D keyword ‘this’ will point to global object (window)

   
   
   
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   1. Ivan says:

      August 12, 2015 at 10:51 pm

      It can’t be the option B, because the calcArea function is calling (this.area = calcArea;) without arguments. The correct answer is D.

      
      
      
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2. rik says:

   August 16, 2015 at 2:49 pm

   Seems to me you are both right.
   Using ‘this’ inside a function that is used as a parameter for a function will make said ‘this’ point to the window object.
   As a workaround, the ‘this’ can be assigned to a variable (‘that’) which is then used as a parameter. So, if “var that = this;” was added to the square() function it should work like so:

   function square(side){
   this.side = side;
   var that = this;
   this.area = calcArea(that);
   }
   function calcArea(obj){
   return obj.side * obj.side;
   }

   So the way I see it, either answers A, B, C and D are all wrong or the question is incomplete.

   
   
   
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3. stijn says:

   August 16, 2015 at 5:03 pm

   answer D is correct

   function square(side) {
   this.side = side;
   this.area = calcArea;
   }

   function calcArea() {
   return this.side * this.side;
   }

   var square = new square(10);
   console.log(square.area()); //result 100

   
   
   
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   1. debbie says:

      October 8, 2015 at 6:25 am

      True, answer D is correct

      
      
      
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