? Function Definitions in JavaScript

Ways to Define Functions in JavaScript

JavaScript supports several ways to define functions, each with its own use cases.

1. Function Declaration

function greet(name) {  return "Hello, " + name;}

• Hoisted — can be called before definition.

• Named function.

2. Function Expression

const greet = function(name) {  return "Hello, " + name;};

• Not hoisted — only available after the assignment.

• Can be anonymous or named.

3. Arrow Function (ES6+)

const greet = (name) => {  return "Hello, " + name;};// Shorter syntax for single expressionconst greetShort = name => "Hello, " + name;

• No own this, arguments, or super.

• Cannot be used as constructors.

• Always anonymous.

4. Named Function Expression

const greet = function sayHello(name) {  return "Hello, " + name;};

• Useful for recursion or better debugging.

Differences Summary

Example Usage

function add(a, b) {  return a + b;}const multiply = function(a, b) {  return a * b;};const divide = (a, b) => a / b;console.log(add(2,3));        // 5console.log(multiply(2,3));   // 6console.log(divide(6,3));     // 2

Want me to explain function scopes, hoisting in detail, or differences between this in functions vs arrow functions?