Introduction to JavaScript Variables and Data Types

JavaScript is a dynamically-typed language, which means you don't need to declare the data type of a variable before using it.

Step 1: Declaring Variables

In JavaScript, you can declare variables using the let, const, and var keywords.

let name = 'John Doe';
const age = 30;
var occupation = 'Software Developer';
console.log(name);
console.log(age);
console.log(occupation);

Step 2: Understanding Data Types

JavaScript has several built-in data types, including Number, String, Boolean, Array, Object, Null, and Undefined.

let num = 10;
let str = 'Hello World';
let bool = true;
let arr = [1, 2, 3];
let obj = { name: 'John', age: 30 };
console.log(typeof num);
console.log(typeof str);
console.log(typeof bool);
console.log(typeof arr);
console.log(typeof obj);

Step 3: Working with Variables and Data Types

Now that you know how to declare variables and understand the different data types, let's work with them.

let x = 5;
let y = 10;
let result = x + y;
console.log(result);
let greeting = 'Hello ';
let name = 'John';
let message = greeting + name;
console.log(message);

By following these steps, you can get started with using variables and data types in JavaScript.