Javascript

The Callback functions are an important part of JavaScript. They are mostly used to run a function in response to the completion of a synchronous or asynchronous task. In this tutorial, we will learn what is a callback function, how to create one, the need for it and some of its use cases using examples

IIFE or Immediately-invoked Function Expressions are functions that we execute immediately after we define them. IIFE was used to isolate the variables and stop polluting the global object. But with the introduction of block scope, modules, let & const statements the IIFE is rarely needed.

In this article, we will explain what is a Scope in JavaScript and how it affects the visibility of variables. JavaScript creates four types of Scopes. They are Global Scope, Module Scope & Local Scope. The Local Scope consists of Block Scope & Function Scope.

Nested functions (or inner functions) in JavaScript are a useful feature. They are functions inside another function. Learn how to create a nested function. How variable scopes, closures & lexical scopes work. Also learn to create multi-level nested function, passing parameters to them etc

The Function Expression is another way to create a JavaScript function. We learned how to create JavaScript Function. In that article, we used the Function Statement or declaration to create the Function. In this tutorial we will look at Function Expression.