π¨βπΌ Fantastic work! You've mastered functional array methods.
You learned:
- π
maptransforms each element - π
filterkeeps elements matching a condition - π
reduceaccumulates into a single value - βοΈ Chaining combines operations fluently
π¦ These methods are the foundation of functional programming in JavaScript and
TypeScript. They appear everywhere:
- React components mapping data to JSX
- Data processing pipelines
- API response transformations
// Real-world example: transform API data
const userNames = apiResponse.users
.filter((user) => user.isActive)
.map((user) => user.displayName)
Next up: Enumsβgiving names to related constants!