Flutter quiz

More questions about Flutter

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which subcommand is used to initialize a new Flutter project?

   Answer: create

   Why: It generates the platform folders as well as the Dart code, and any you leave out can be added back to the project later.

2. 2 Medium

   Which method is called exactly once when a State object is created?

   Answer: initState

   Why: It runs before the first build, which is why controllers and subscriptions belong here rather than in the builder.

3. 3 Hard

   In Flutter, which method contains the actual commands that draw shapes on screen?

   Answer: paint

   Why: It receives a canvas and a size, and the companion method beside it decides whether the work needs doing again at all.

4. 4 Easy

   What was the original internal project name for Flutter at Google?

   Answer: Sky

   Why: It was unveiled at a developer summit in 2015 running on Android, with the stated aim of rendering consistently at 120 frames per second.

5. 5 Medium

   Which testing class is the fastest utility for executing UI tests?

   Answer: WidgetTester

   Why: The flutter test command drives it inside a headless Flutter shell on your workstation, so no device or emulator ever has to boot.

6. 6 Hard

   In the Flutter layout protocol, what goes down from parent to child?

   Answer: constraints

   Why: They go down, sizes come back up, and the parent then sets the position, which is the whole layout algorithm in one line.