JS Tutorial



JS FUNCTIONS


JavaScript Functions

Functions in JavaScript are blocks of code that can be called to perform a specific task. They help to organize code, reduce redundancy, and make programs easier to maintain.

🔹 Types of Functions:
  • Function Declaration
  • Function Expression
  • Arrow Functions

📌 Function Declaration

A Function Declaration defines a named function that can be called anywhere in the code.

Syntax

function functionName(parameters) {
  // code block
}

Example: Simple Addition

function add(a, b) {
  return a + b;
}
let result = add(5, 3);
console.log(result); // Output: 8

📌 Function Expression

A Function Expression is a function that is defined within an expression, such as a variable assignment.

Syntax

const functionName = function(parameters) {
  // code block
};

Example: Simple Multiplication

const multiply = function(a, b) {
  return a * b;
};
let result = multiply(5, 3);
console.log(result); // Output: 15

📌 Arrow Function

An Arrow Function provides a shorter syntax for writing functions and doesn't have its own this.

Syntax

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

Example: Simple Subtraction

const subtract = (a, b) => {
  return a - b;
};
let result = subtract(5, 3);
console.log(result); // Output: 2

🧪 Try It Yourself




Function output will appear here
📘 Summary:
JavaScript functions come in different forms: Function Declarations, Function Expressions, and Arrow Functions. Choose the type that best suits your needs based on the use case.

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