JavaScript Bind Call Apply Explained

Veröffentlicht am: 30 August 2020
auf dem Kanal: Code With Bubb

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In this tutorial, we’ll take a look at the JavaScript bind call and apply functions and see how you can use them to ‘borrow’ functions from other objects.

Check out the previous tutorial on the ‘this’ keyword if you’re not quite sure about how that works:    • JavaScript this Explained

JavaScript Bind Call Apply Explained
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00:00 Introduction
00:45 Basic example
01:41 JavaScript call example
02:44 JavaScript apply example
03:15 JavaScript bind example
03:56 More examples

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So once you have a hang of the JavaScript this keyword and how it can change it’s value depending on the execution context it is used in, understanding the JavaScript bind call apply functions is quite simple.

In this JavaScript tutorial, you’ll learn how to dynamically change the value of ‘this’ by passing in a new object to a specific JavaScript function.

This allows you to ‘borrow’ functions from other objects and use them to update properties or return new values (or do anything your heart desires!) with a different ‘this’ context.

This is a powerful technique allowing you to re-use code from other parts of your codebase and make your JavaScript code easier to maintain as the functions used by a JavaScript call function for example will only be needed once.

We’ll go through a couple of examples in the JavaScript tutorial and I’ll show you first how the JavaScript bind call apply functions work with some simple objects and you’ll see the main differences between call and apply as well as how the bind function in JavaScript works.

Don’t forget to check out the tutorial on the JavaScript this keyword first if you’re not sure about it:    • JavaScript this Explained
You’ll need to have a pretty good idea of what ‘this’ is in JavaScript and how it’s value can change in different contexts. This will make understanding Javascript bind call and apply functions easier. Channel Handle @codebubb

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