🎯 JavaScript Variables & Data Types Explained 🚀

📌 JavaScript Variables & Data Types Explained! 🚀

JavaScript variables store data, making your code dynamic and interactive! 💡 There are three main ways to declare variables:

✅ var – Older way, function-scoped.
✅ let – Modern, block-scoped (recommended).
✅ const – For values that don’t change.

📌 JavaScript Data Types
JavaScript has two main types of data: Primitive and Non-Primitive.

✅ Primitive Data Types:
🔹 String – Text values ("Hello, world!")
🔹 Number – Numeric values (42, 3.14)
🔹 Boolean – True or false (true, false)
🔹 Undefined – A variable declared but not assigned (let x;)
🔹 Null – A value that represents “nothing” (let y = null;)
🔹 Symbol – Unique, immutable values (used in advanced cases)
🔹 BigInt – For very large numbers (9007199254740991n)

✅ Non-Primitive Data Types:
🔹 Object – Collections of key-value pairs ({ name: "Romal", age: 25 })
🔹 Array – A list of values ([1, 2, 3, "JavaScript"])
🔹 Function – A block of reusable code (function greet() { console.log("Hello!"); })

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