JavaScript Function

A function is a block of code that we create to perform a particular task.

Instead of writing the same code again and again we can write it once inside a function and call the function whenever we need it.

Example

javascript
function greet() {
console.log("Hello Raj");
}

greet();

How it works

function greet()
↓
Function is created
↓
Code is written inside {}
↓
greet()
↓
Function is called
↓
"Hello Raj" is printed

Why do we use functions?

Functions help us to:

• Reuse code
• Avoid writing the same code again
• Keep code clean and organized
• Make programs easier to understand
• Perform a specific task whenever needed

Function with Parameters

We can also send information to a function.

javascript
function greet(name) {
console.log("Hello " + name);
}

greet("Raj");
greet("Kumar");

Output:

Hello Raj
Hello Kumar

Herename is called a parameter.

The value "Raj" is called an argument.

**
Function with Return**

A function can also return a value.

javascript
function add(a, b) {
return a + b;
}

let result = add(10, 20);

console.log(result);

Output:

30

Here return sends the result back from the function.