JavaScript Keyword This

The keyword This

In JavaScript the execution context for an execution is by default global. That means that when this is used in a function it refers to the owner of the function, that is in the object where it exists. I JavaScript there are some differences between strict mode and non-strict  mode and mostly  the value of this is determined by how a function is called. 

The value this cannot be set by assignment during execution and the value can be different every time the function is called.

The expression this

JS JavaScript - The expression this

var aThisTest = {
    prop: 66,
    func: function () {
    return aThisTest.prop;
// Output: 66

This expression in a global context

When we are operating in a global execution context (not inside any function), this refers to the global object both in strict and none-strict.

JS JavaScript - This expression in a global context

// In a web browser the global object is the same as the window object.
alert(this === window); // Result: true
count = 99;
alert(window.count); // Result: 99
this.testString = "Honneybag";
alert(window.testString )  // Result: "Honneybag"
alert(testString )                // Result: "Honneybag"

Learn more about JavaScript Scope

This expression in a function context - none strict mode

When the value of this isn't set by the call and the code is in none-strict mode, this is by default set the global object. The global object in this context is the window in a browser.

JS JavaScript - The expression this - none strict mode

function TestThisFunction() {
    return this;
TestThisFunction() === window; // true: the result in a browswer
TestThisFunction() === global; // true: the result in node

This expression in a function context - strict mode

When using the value of this in strict mode it stays the same as it was set to, when entering the execution context. Therefore in this example this will be undefined.

JS JavaScript - The expression this - strict mode

function TestThisFunction() {
'use strict'; // see strict mode
    return this;
TestThisFunction() === undefined; // true


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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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