Code

console.log("Hello World");

// Variable declarations
let country;
let name = "XYZ";
let age = 21;
const gender = "male";

/*
  - Variable should not start with a number
  - Should start with a letter or underscore
  - Should not contain special characters or spaces
  - Can contain letters, numbers, and underscores
  - Case sensitive
  - CamelCase is recommended
*/
let firstName = "XYZ";

console.log(name, age, gender, country);

age = 22;
country = "India";

console.log(name, age, gender, country);

// Primitive data types: number, string, boolean, null, undefined
let num = null;

// Non-primitive data types: array, object, function, date, promise
Code

Console
