JavaScript this Explained

JavaScript this Explained

In this tutorial we'll explain how the JavaScript this keyword obtains it's value, how you can recognise what the value of this will be and how you can preserve it's value within your code. JavaScript this explained.

In this tutorial we'll explain how the JavaScript this keyword obtains it's value, how you can recognise what the value of this will be and how you can preserve it's value within your code. JavaScript this explained.

00:31 Global Execution Context 00:46 Function Execution Context 01:46 Objects Execution Context 02:41 Arrow functions (lexical this) 03:26 Preserving this 05:13 Constructor functions

One thing that can confuse new and existing JavaScript developers alike is the this keyword in JavaScript.

In this JavaScript tutorial we'll take a look at the this keyword and how it obtains it's value at different points within your JavaScript code. These points are known as execution contexts and depending on where you use the JavaScript this keyword you will be working in a different execution context.

We'll also look at how you can preserve the value of this within your JS code using some older techniques and also using ES6 arrow functions. JavaScript this arrow functions has a different approach to handling the this keyword as you will see in the tutorial.

javascript tutorial python

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