Drill 21: Beginner mistake — Streams and functional pipelines

import java.util.List;
import java.util.stream.Collectors;

record Lesson(String title, int minutes) {}

List<Lesson> lessons = List.of(
    new Lesson("HTML", 8),
    new Lesson("CSS", 12),
    new Lesson("Grid", 16)
);

List<String> shortTitles = lessons.stream()
    .filter(lesson -> lesson.minutes() < 15)
    .map(Lesson::title)
    .collect(Collectors.toList());