function prototype in javascript

Question

I have a function which I am using as a constructor. When I assign a function to it prototype and invoke the function, I only see the value x and not the testMethod which I augmented. I was expecting the augmented function also to be printed when i refer to the this. Is my understanding correct.

function Test(x){
 this.x=x;
}

Test.prototype.testMethod=function(){
  console.log(this);
}

var t= new Test(5);
t.testMethod();

this refers to the instance you've created, if you check its prototype you'll see your function. — Henrik Andersson
– Henrik Andersson, Commented Jul 31, 2015 at 5:32

Tushar · Accepted Answer · 2015-09-01 08:03:19Z

2

Because function testMethod() is in the prototype, you cannot see it in the console. It is hidden in the __proto__ property.

If you expand __proto__ in your console, you'll see it.

edited Sep 1, 2015 at 8:03

answered Jul 31, 2015 at 5:31

Tushar

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