Types of Functions

1.Named Function:

• A function is created using the function keyword with a name.

Syntax:

function functionName() {
    // code
}

Example:

// Named Function

function addition(a,b,c)
{
    console.log(a+b+c);
}

addition(40,20,40);

Output:

100

---

2.Function Expression

• A function is stored inside a variable.

Syntax:

let variableName = function() {
    // code
};

Example:

// Function expression

let greet=function(){
    console.log("Hello");
};

greet();

Output:

Hello

---

3.Arrow Function:

• A shorter way to write functions.

Syntax:

const functionName = () => {
    // code
};

Example:

const multiply=(a,b)=>{
    console.log(a*b);
}

multiply(10,20);

Output:

200

Arrow Function With One Parameter:

Example:

const square = num => num * num;

console.log(square(5));

Output:

25

Parentheses are optional when there is only one parameter.

---

4.Immediately Invoked Function Expression (IIFE):

• A function that is created and executed immediately.

Syntax:

(function() {
    //code
})();

Example:

(function() {
    console.log("Hello");
})();

Output:

Hello

---

Comments

[Jon Randy 🎖️]

Function expression and storing a function in a variable are two different things

[Rakshambika]

Yes, they're related concepts, but they aren't the same thing.