It is now possible to use JavaScript on both the frontend and the backend with frameworks like Node.js and Deno.īut was JavaScript made for creating large, complex systems like the ones on the modern web? No. Historically, JavaScript has ended up as the main language for scripting web pages and apps on the Internet. About 60% of JS programmers already use TypeScript, and 22% wish to try. Angular, one of the largest frontend frameworks, is using TypeScript. So the internally created this will be bound to the new object being created here, which is tom.TypeScript has been increasing in its popularity for the last couple of years. Here the function Cartoon is invoked with the new keyword. Take this line, let tom = new Cartoon('Tom', 'Cat') The newly created this binds to the object being created using the new keyword. function sayName() ) within the function. In the example below, the variable name is lexically inside the function sayName(). In JavaScript, a Lexical Environment is where your code is physically written. In this article, we will learn about all five aspects with examples. The usage of this can be categorized into five different binding aspects.

Because we don't know what is in the this keyword until the function is invoked. When it comes to this, the fundamental thing is to understand where a function is invoked.

The this keyword is very closely associated with JavaScript functions. Identifying the object in the current execution context when we invoke a method.It means, a function once defined can be invoked for different objects using the this keyword.

Reuse functions in different execution contexts.In JavaScript, the this keyword allows us to: But it is critically important for writing more advanced JavaScript code. JavaScript's this keyword is one of the hardest aspects of the language to grasp.

What is the use of javascript