JS-Gym

1. JavaScript Core Concepts

Variables, Scoping, & Hoisting
Closures
Prototypal Inheritance
Functions
Event Handling

2. DOM Manipulation

Direct DOM Access
Event Listeners
Updating the DOM

3. Front-End-Specific Algorithms

Rendering Algorithms
Traversal
String Manipulation

4. Asynchronous Programming & Promises

Promises, Callbacks, & Async/Wait
Event Loop & Single-Thread Environment

5. ES6+ Features

Arrow Functions
Destructuring (objects and arrays)
Spread & Rest Operators (...)
Modules (import/export)
Template Literals (using backticks for string interpolation)

6. Data Structures & Algorithms in JavaScript

Arrays (map, reduce, filter, etc.)
Objects & Maps/Sets
Recursion
Big O Notation

7. Testing & Debugging

Browser Developer Tools
Unit Tests (Jest & Mocha)

8. Front-End Performance

Optimize Front-End Performance (lazy loading images, diff HTTP requests, minimizing DOM updates)
Identify Bottlenecks (excessive reflows/repaints, debouncing/throttling)