does javascript’s this object refer to newly created object in the way i think

by

Your phrasing is a bit confusing, but I’ll do my best. First, you should note that your curly braces are a bit off. Your code should look like this:

function ObjectCreate(){
   this.a = "a";
   this.b = "b";
}

ObjectCreate.prototype.show = function(){
     alert(this.a+" "+this.b);
}

obj1 = new ObjectCreate();

You need to define your constructor, then attach things to its prototype.

When you call the constructor, the this keyword does basically refer to the new object being created. This is important because, for example, you could write a constructor like:

function ObjectCreate(x,y){
   this.a = x*x;
   this.b = y*x+4;
}
obj1 = new ObjectCreate(10,20);

Here, as in all constructors, this refers to the instance being created (obj1, in this case).

I think you suggested that this refers to the object’s prototype, but that would make this.a and this.b static variables, which would be useless in a constructor like the one here, since every time you initialized a new object you would change the vale of this.a and this.b for all previously existing objects, and that just isn’t useful.

I hope that answered your question. If not, please go ahead and leave comments for further clarification.

More Related Contents:

  1. What is the reason to use the ‘new’ keyword at Derived.prototype = new Base
  2. Is it bad practice to have a constructor function return a Promise?
  3. Use of .apply() with ‘new’ operator. Is this possible?
  4. JavaScript inheritance and the constructor property
  5. What is the significance of the Javascript constructor property?
  6. What values can a constructor return to avoid returning this?
  7. ES6: call class constructor without new keyword
  8. Using “Object.create” instead of “new”
  9. Understanding prototypal inheritance in JavaScript
  10. How to detect if a function is called as constructor?
  11. What is the `constructor` property really used for? [duplicate]
  12. Setting methods through prototype object or in constructor, difference? [duplicate]
  13. Can I use arrow function in constructor of a react component?
  14. Javascript “Not a Constructor” Exception while creating objects
  15. Why should you not use Number as a constructor? [duplicate]
  16. Can I construct a JavaScript object without using the new keyword?
  17. What does calling super() in a React constructor do?
  18. When is it appropriate to use a constructor in REACT?
  19. Asynchronous constructor
  20. Function and Object Javascript
  21. JSLint Error: Unexpected ‘this’
  22. OO Javascript constructor pattern: neo-classical vs prototypal
  23. Advantages of setting the “constructor” Property in the “prototype”
  24. JavaScript: using constructor without operator ‘new’
  25. Can you help me make my code a little simpler and shorter please? thanks [closed]
  26. How to subtract days from a plain Date?
  27. What is the meaning of the ‘g’ flag in regular expressions?
  28. Validating user’s UTF-8 name in Javascript
  29. Upload files to Firebase Storage using Node.js
  30. Google Maps API v3 adding an InfoWindow to each marker

Leave a Comment