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Hello-world code 🤌 :

console.log("Hello World) ;

// console.log() prints the message to the console.

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Variables in JS 📦 :

Variables store data values and can be declared using var, let, or const.

var name = "HITESH"; 
let age = 25; //  allows reassignment
const PI = 3.14; // Constant, cannot be reassigned

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Data Types 🔢 :

JS supports two main types of data types which are classified on the basis of how they are stored and accessed in memory.

1. Primitive Data types :- (Stored by value & are immutable)

• String: "Hello, World!"

• Number: 10, 3.14

• Boolean: true, false

• Undefined: A variable that has been declared but not assigned a value.

• Null: A special value representing "nothing".

• Symbol: A unique and immutable value used as object properties.

• BigInt: Used for numbers larger(like Moon’s🌕 distance from Earth🌍).

2. Non-Primitive Data types :- (Stored by reference & are mutable)

• Array: [1, 2, 3]

• Object: { name: "John", age: 25 }

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Conclusion 🎉 :

In summary, mastering JavaScript requires understanding its core elements, like variables and data types. By learning the distinctions between primitive and non-primitive data types, we can write more efficient code. Happy coding!