Arrow Functions in JavaScript

Arrow functions, introduced in ES6 (ECMAScript 2015), provide a shorter syntax for writing functions. They are especially useful in functional programming and callbacks.

📝 Basic Syntax

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

// Arrow function
const add = (a, b) => a + b;

console.log(add(2, 3)); // Output: 5

🎯 Features

• Simpler syntax, especially for small functions
• Does not bind its own this value
• Best used for callbacks or inline functions

💡 One-Liner Arrow Functions

const square = x => x * x;
console.log(square(5)); // Output: 25

📦 Multiple Lines & Return

const greet = name => {
    const message = "Hello, " + name;
    return message;
};

console.log(greet("Alice"));

⚠️ Arrow Functions and this

Unlike regular functions, arrow functions do not have their own this. They inherit it from the surrounding lexical scope.

const person = {
    name: "Bob",
    greet: function() {
        setTimeout(() => {
            console.log("Hi, I'm " + this.name);
        }, 1000);
    }
};

person.greet(); // Output: "Hi, I'm Bob"