| Topic | Key takeaways for 2025+ | |--------|--------------------------| | | const (default) → let (when reassigning) → never var | | Functions | Declarations (hoisted) vs expressions (not). Arrow functions ( => ) – no own this | | Arrays | .map() , .filter() , .reduce() – practice these daily | | Objects | Dot vs bracket notation. Object methods & this | | DOM | querySelector , addEventListener , classList, textContent |
Even though the course is from 2020, its core JavaScript (ES5/ES6/ES7) is still today. The main differences from 2024+ would be modern tooling (Vite instead of Parcel) and a few newer features (optional chaining, nullish coalescing). | Topic | Key takeaways for 2025+ |
const res = await fetch(`https://www.themealdb.com/api/json/v1/1/search.php?s=$query`); | Section | Why it matters in 2025 | |----------|--------------------------| | Closures | Used in React hooks, event handlers, factory functions | | this binding | Required for class-based components & debugging | | Async (callbacks → promises → async/await) | Fetch API, timers, file uploads | | OOP (ES6 classes) | Still the standard for many codebases | The main differences from 2024+ would be modern