| Feature | Status in 2020 Course | Relevance in 2026 | | :--- | :--- | :--- | | var , let , const | In-depth | ✅ Still essential | | Arrow Functions | Core module | ✅ Still essential | | Promises & Async/Await | Modern approach | ✅ Still essential | | (BigInt, ?? , ?. ) | Included as "new" | ✅ Standard practice | | Build Tools (Webpack/Parcel) | Only briefly mentioned | ⚠️ Dated (Now Vite/esbuild dominates) | | JS Frameworks (React/Vue) | Not included (pure vanilla focus) | ✅ Intentional (Teaches fundamentals) |