What is Bind method in JavaScript

In this post we will take a look on Bind function in JavaScript. This method Bind a function to an Object.

For example if you have a function as following,

function FindSquare(number) {

return number * number;

And you have created an object as below,

var Calculator = {};

As you see that calculator object does not contain any properties or method. Now let us say you want to bind function FindSqaure to object Calculator then you can do that using Bind method in JavaScript.

  1. Bind method binds a function to object
  2. It returns a function after binding

So you can bind FindSquare function to Calculator object as below,

var CFindSquare = FindSquare.bind(Calculator);

Now when you call CFindSquare function and pass parameter, it will actually get passed to original function FindSquare.

You can invoke FindSquare method on object Calculator as follows,

var result = CFindSquare(8);

In this way you can work with bind() method in JavaScript. I hope you find this post useful. Thanks for reading.

Published by

Dhananjay Kumar

Dhananjay Kumar is Developer Evangelist for Infragistics. He is a 8 times Microsoft MVP and well respected Developer Advocate in India.He is the author of 900+ Blog Posts, and can often be found speaking around India at conferences and hosting free workshops for programmers across the country. So far, he has hosted 60 free workshops on various topics like JavaScript, Angular, WCF, ASP.NET MVC, C#, Azure etc. Follow him on twitter @debug_mode for all the updates about his blog posts and workshops. You can send him email at debugmode [at] outlook [dot] com

7 thoughts on “What is Bind method in JavaScript”

  1. Thanks for the post.
    It will be great if you explain the scenarios where it will be useful and advantage of it?

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