Introduction to JavaScript Primitive Data Types

Data types are used to optimize the data that a variable can contain. Understanding primitive data types is a basic building block of when learning JavaScript

There are two categories of data types

1. Primitives
2. Objects

There are five primitive types:

1. string

• Example: "hello there!", 'hello there'

2. number

• Example: 1, 200, 3.14159

3. boolean

• Example: true, false
• Booleans are used in control structures like conditional statements

4. undefined

• Example: undefined is the default value for any variable that has been declared but has not been assigned a value

5. null

• null is a representation of the intentional absence of any object value. Often used to indicate that a variable should hold a value and doesn't

Getting Started

1. Create a new project directory with an index.html and main.js file
2. Link your main.js file with your index.html file by adding <script src="main.js"></script> just before the /body tag in the index.html file
3. Create and assign a variable for all JavaScript data types in the main.js file
4. You should console.log the typeof each variable like the example below

let x = 'Sally Smith'; console.log(typeof x);

5. Mutate each variable and console.log typeof each
6. Perform mathematical operations using mixed data types and console.log typeof each