Kotlin Kotlin Coroutines 3

Question 1

What is the difference between `StateFlow` and `SharedFlow` in Kotlin?

Accepted Answer

StateFlow holds the latest value and replays it to new collectors; SharedFlow is configurable

Answer

StateFlow is hot and holds state; SharedFlow is cold and stateless

Answer

There is no difference

Answer

SharedFlow holds state; StateFlow does not

Question 2

What does `SupervisorJob` do differently from a regular `Job`?

Accepted Answer

It prevents child coroutine failures from cancelling sibling coroutines

Answer

It runs coroutines faster

Answer

It automatically retries failed coroutines

Answer

It blocks the thread until completion

Question 3

Which operator transforms each emitted value of a Flow into another Flow and flattens the results?

Accepted Answer

flatMapLatest

Answer

map

Answer

filter

Answer

collect

Question 4

What is the purpose of `CoroutineExceptionHandler`?

Accepted Answer

To handle uncaught exceptions in coroutines as a last resort

Answer

To cancel all coroutines on an exception

Answer

To retry failed coroutines

Answer

To log coroutine performance

Question 5

What does `produce` coroutine builder create?

Accepted Answer

A Channel that receives values produced by a coroutine

Answer

A Flow

Answer

A Deferred result

Answer

A StateFlow

Question 6

How do you make a Flow cold vs. hot in Kotlin?

Accepted Answer

Cold Flows are built with flow{}; hot Flows are StateFlow or SharedFlow

Answer

Cold Flows use collect(); hot Flows use emit()

Answer

There is no distinction in Kotlin

Answer

Hot Flows use flowOf(); cold Flows use channelFlow()