JavaScript Tutorial (Part 22)-Functions in JavaScript

Functions in JavaScript are reusable blocks of code designed to perform specific tasks. You define a function once, and it can be called or invoked multiple times within your program, improving efficiency and reducing code redundancy.

Key Features of JavaScript Functions

1. Reusability: Functions can be used multiple times, avoiding the need for repetitive code.

2. Modularity: Breaks complex tasks into smaller, manageable pieces.

3. Maintainability: By hiding complex logic inside functions, the overall complexity of the code is reduced.

4. Recursion: Functions can call themselves to solve recursive problems.

5. Flexibility: JavaScript functions can accept arguments (parameters) to perform operations dynamically.

Function Syntax:

There are different ways to define a function in JavaScript. Here’s the basic syntax:

1. Function Declaration:

- The keyword function is used.

- A function name is followed by parentheses that contain the function parameters (optional).

- The function body is enclosed in curly braces {}.

Example:

2. Function Expression:

A function can also be stored in a variable, which is known as a function expression. This function may or may not have a name.

Example:

3. Arrow Functions: