JavaScript Arrow Functions

Arrow functions are a concise way to write functions in JavaScript, introduced in ES6. They use the => syntax and do not require the function keyword.

Syntax

const add = (a, b) => a + b;
console.log(add(5, 3)); // Output: 8

Single Parameter (No Parentheses Needed)

const square = x => x * x;
console.log(square(4)); // Output: 16

No Parameters (Requires Empty Parentheses)

const greet = () => "Hello, world!";
console.log(greet()); // Output: Hello, world!

Multiline Function (Using {} and return)

const multiply = (a, b) => {
 let result = a * b;
 return result;
};
console.log(multiply(4, 5)); // Output: 20

Features of Arrow Functions

• Shorter syntax
• No this binding (inherits from surrounding scope)
• Implicit return for single expressions
• Useful for callbacks and array methods