Types of Functions in JavaScript

1. Function Declaration This is the basic way to create a function. Example: function sayHello() { console.log("Hello"); } sayHello(); Output: Hello 2. Function Expression Here, the function is stored in a variable. Example: const sayHello = function() { console.log("Hello"); }; sayHello(); Output: Hello 3. Arrow Function (Lambda) Short and modern way to write functions. Example: const sayHello = () => { console.log("Hello"); }; sayHello(); Output: Hello 4. Anonymous Function Function without a name. Example: const greet = function() { return "Hi there!"; }; console.log(greet()); Output: Hi there! 5. Callback Function A function passed inside another function. Example: function greet(name, fun) { fun(name); } greet("Ram", function(name) { console.log("Hello " + name); }); Output: Hello Ram 6. IIFE (Immediately Invoked Function) Runs immediately after writing. Example: (function() { console.log("Run now"); })(); Output: Run now 7. Constructor Function Used to create objects. Example: