Inheriting a Javascript Function

Question

I have a JS definition like this in a .js file which is included in my .html file.

function chat() {
  this.sendNew() = function() { 
  [ .. ]
  }
}

Now I want to add another .js file which can extend this function with more methods, like this

function chat() { 
  this.anotherMethod = function() { 
  }
}

Is this possible? If yes, how? :)

Danilo Valente · Accepted Answer · 2014-02-19 14:40:09Z

4

You can add methods/attributes to the .prototype object:

chat.prototype.anotherMethod = function () {
    // ...
}

Just remember that .prototype is a property of functions, and then should be accessed by chat, and not by one of its instances.

You can read more about .prototype here.

answered Feb 19, 2014 at 14:40

Danilo Valente

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3 Comments

Vikas Singhal Over a year ago

My bad, I didn't notice that chat() was instantiated later in the code using ch = new chat(). So, finally I ended up added new method to ch itself. Thanks anyways!

Danilo Valente Over a year ago

You can also assign anotherMethod to the instance by doing ch.anotherMethod = ..., but then you'll only be extending the instance rather than the class itself.

Vikas Singhal Over a year ago

You are right, but got insightful info about prototype today, thanks :)

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