In modern JavaScript (ES6+), arrow functions provide a concise way to write function expressions. They simplify syntax and handle the this keyword differently than traditional functions.

Arrow functions are especially useful in callbacks, array methods, and concise return logic.

Syntax: (parameters) => expression

This is the basic way to declare functions using the function keyword. It allows reusability and is hoisted in JavaScript.

In function expressions, a function is stored inside a variable. It is not hoisted and must be declared before use.

Arrow functions are a modern alternative to function expressions. They use the => syntax and are shorter.

If there’s only one parameter, parentheses are optional. This makes it super concise.

Use parentheses to enclose multiple parameters.

When the function body is more complex, you must use curly braces and an explicit return.