10 of 32 lessons

Video Lesson

Lesson Notes

JavaScript Primitives

JavaScript has several primitive data types—simple values not objects.

// String
typeof "Hello" === "string"

// Number
typeof 42 === "number"

// BigInt
typeof 9007199254740991n === "bigint"

// Boolean
typeof true === "boolean"

// Undefined
typeof undefined === "undefined"

// Null
// typeof null === "object"  // a known quirk in JS

// Symbol
typeof Symbol('id') === "symbol"

// Example usage
let name = "Alice";        // string
let age = 30;              // number
const isStudent = false;   // boolean
let uniqueId = Symbol('id'); // symbol

console.log(name, age, isStudent, uniqueId);

AI Assistant

Sign In Required

Sign in and subscribe to use the AI assistant for instant help with your lessons.

Javascript "null" vs "undefined"

Primitives in Javascript

A brief overview of the basic, non-object data types in JavaScript. JavaScript has several primitive data types—simple values not objects.

5m 56s

Course Content

0 of 32 lessons completed

1. Introduction & Setup

0 of 4 completed

Setting up VS Code

Creating Your First HTML Page with VS Code and AI

Creating and Linking Your First JavaScript File in VS Code

Understanding the Basic HTML Structure for JavaScript Integration

2. Variables, Data Types, Operators

0 of 9 completed

Variables using the "var" keyword

Variables with "const" and "let" keywords

Code comments

String Interpolation (Template Literals)

Block Scope

Primitives in Javascript

Javascript "null" vs "undefined"

Equality Operators in JavaScript

Greater Than and Less Than in JavaScript

3. Control Structures ("If", "Else" statements and loops)

0 of 7 completed

Conditional Logic: `if`, `else if`, and `else`

Switch Statements

Basic For Loop

While Loop: Basics

`do...while` Loop Explained

Nested Loops in JavaScript

`break` and `continue` in JavaScript Loops

4. Arrays, Objects and Iterables

0 of 7 completed

Basic Arrays in Javascript

Exploring Array Properties

Array Indexing, Access Elements

Array Iteration with JavaScript For Loops

Array Iteration: Using `for...of` in JavaScript

Basic Objects in JavaScript (Simple)

Basic This

5. Functions

0 of 5 completed

Basic functions

Return values from functions

Function Expressions

Arrow functions

"this" keyword in arrow functions

6. Promises, Async and Await

0 of 0 completed

7. The DOM

0 of 0 completed