feat: add four ways to write functions

Author: ExploitEngineer

part5 (Functions)/AdvanceFunctions/06_four.ways.to.write.function.js

@@ -0,0 +1,32 @@
+// INFO: Four ways to write function
+
+/*
+NOTE: Why this matters ? 
+JavaScrpit allows multiple ways to define fucntions, and each has different behaviour in terms of: 
+1. Hoisting 
+2. this binding 
+3. Syntax clarity 
+4. Use cases 
+*/
+
+// 1. Function Declaration 
+greet();
+function greet() {
+ console.log("Hello");
+}
+
+// 2. Function Expression 
+const user = function(user) {
+ console.log(`Welcome ${user}`);
+}
+user("Rafay");
+
+// 3. Arrow Function (ES6)
+const add = (a, b) => a + b;
+add(3, 3);
+
+
+// 4. IIFE 
+(function() {
+ console.log("I run immediately!");
+})();