confusion with javascript prototype object

Question

when we create an object like this

function Person(first,last){

this.first = first;
this.last = last;
this.full = function (){
   alert(this.first + " " + this.last); 
   }
}

obj = new Person('abdul','raziq');

could we also add to obj's prototype anything like this

obj.prototype = 'some functions or anything ';

or its not possible once we created the object ?

and there is a __proto__ property on person object

obj.__proto__

but when i access obj.prototype property its undefined ?

can someone pls explain in a simple way possible

The answer is yes, you can add to the prototype after an object instance is created. — Explosion Pills, Mar 12 '13 at 05:17
i want to add to obj prototype property , is it possible to add to obj prototype property something — raziq ijr, Mar 12 '13 at 05:19
Only functions have a `prototype` property. Add it to the prototype of the constructor function instead. — Aadit M Shah, Mar 12 '13 at 05:21

score 1 · Answer 1 · edited May 23 '17 at 12:28

1

The prototype property only exists on functions, not on instances of functions. Read this StackOverflow answer to know more: https://stackoverflow.com/a/8096017/783743

edited May 23 '17 at 12:28

Community

1
1

answered Mar 12 '13 at 05:19

Aadit M Shah

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score 0 · Answer 2 · answered Mar 12 '13 at 05:15

0

You can do something like

Person.prototype.full = function(){
   alert(this.first + " " + this.last); 
}

Demo: Fiddle

The prototype object is attached to the Class not to the instance so yes you can add/remove properties to/from prototype after instances are created. And all instances of the type will reflect the changes made.

answered Mar 12 '13 at 05:15

Arun P Johny

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sorry i have corrected my question pls read it once again thanks – raziq ijr Mar 12 '13 at 05:17

confusion with javascript prototype object

2 Answers2