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JavaScript

Beginner to Advanced

ES6+, DOM, Async

21Lessons·9Chapters
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FunctionsDOMError HandlingTypeScript
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1 lessons
JavaScript Learning GuideContinue
30 minRead
01 Basics
5 lessons
What is JavaScript?
30 minRead
Variables (var, let, const)
45 minRead
Data Types
45 minRead
Type Conversion and Equality Comparison
40 minRead
Control Flow — if · for · while · switch
45 minRead
02 Functions
4 lessons
Function Basics
45 minRead
Arrow Functions
30 minRead
Scope and Closures
1 hrRead
this Binding — Implicit/Explicit/Arrow Functions, call/apply/bind
30 minRead
03 Objects & Arrays
2 lessons
Array Higher-Order Functions
1 hrRead
Object Essentials — Creation · Access · Destructuring · Spread
45 minRead
04 DOM
2 lessons
What is DOM?
30 minRead
Event Handling
1 hrRead
05 Async
3 lessons
Event Loop
45 minRead
Promise
1 hrRead
Async/Await
45 minRead
06 Error Handling
1 lessons
Error Handling — try/catch/finally + Custom Errors
45 minRead
07 Advanced
2 lessons
Prototypes
45 minRead
ES2022–2025 Modern Syntax — A Staple in AI-Generated Code
45 minRead
08 TypeScript
1 lessons
TypeScript Essentials — Reading Type Errors & Avoiding any
45 minRead

JavaScript Learning FAQ

Can I learn JavaScript for free?

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Can beginners follow the JavaScript course?

Yes. Every lesson follows concept → code example → interactive demo → quiz, so you can follow along with no prior knowledge.

How long does it take to learn JavaScript?

Each lesson is about 30-60 minutes on average. At 1-2 lessons a day, you can finish the whole category in about 1-2 months.

Can the AI mock interview be based on JavaScript too?

Yes. CodeMaster's 4-turn AI mock interview covers algorithms, system design, CS knowledge, and vector DBs, and gives feedback on real interview questions including JavaScript.

Free JavaScript course — 21 lessons | CodeMaster