feat: add update primites.js file

Author: ExploitEngineer

part2 (Data Types and Primitives)/01_primitives.js

@@ -0,0 +1,44 @@
+// Primitive Data Types in JavaScript
+// These are the most basic data types — stored directly by value (not by reference).
+
+// 1. Number
+let age = 25; // Integer
+let pi = 3.14; // Float
+
+console.log(typeof age); // "number"
+console.log(typeof pi);  // "number"
+
+// 2. String
+let name = "Rafay";
+let greeting = `Hello, ${name}!`; // Template string (string interpolation)
+
+console.log(typeof name);      // "string"
+console.log(greeting);         // "Hello, Rafay!"
+
+// 3. Boolean
+let isOnline = true;
+let isAdmin = false;
+
+console.log(typeof isOnline);  // "boolean"
+
+// 4. Null
+let emptyValue = null;
+
+console.log(typeof emptyValue); // "object" (⚠️ a known JavaScript quirk)
+
+// 5. Undefined
+let notAssigned;
+
+console.log(typeof notAssigned); // "undefined"
+
+// 6. BigInt
+let bigNumber = 1234567890123456789012345678901234567890n; // Add 'n' at the end
+
+console.log(typeof bigNumber); // "bigint"
+
+// 7. Symbol
+let uniqueId1 = Symbol("userId");
+let uniqueId2 = Symbol("userId");
+
+console.log(typeof uniqueId1); // "symbol"
+console.log(uniqueId1 === uniqueId2); // false – every Symbol is unique!