Kotlin Kotlin Coroutines

Question 1

What keyword is used to define a suspending function in Kotlin?

Accepted Answer

suspend

Answer

The `suspend` keyword marks a function that can be paused and resumed, making it usable within coroutines.

Question 2

Which coroutine builder launches a new coroutine and returns a Job?

Accepted Answer

launch

Answer

`launch` is a coroutine builder that starts a new coroutine and returns a `Job` handle for managing it.

Question 3

What does the `async` coroutine builder return?

Accepted Answer

Deferred

Answer

`async` launches a coroutine and returns a `Deferred<T>` object, which represents a future result retrievable via `await()`.

Question 4

Which coroutine scope is used to run coroutines that block the current thread?

Accepted Answer

runBlocking

Answer

`runBlocking` creates a coroutine scope that blocks the current thread until all coroutines inside it complete.

Question 5

What is the purpose of `withContext` in Kotlin coroutines?

Accepted Answer

To switch the coroutine dispatcher without creating a new coroutine

Answer

`withContext` suspends the current coroutine and switches to a different dispatcher or context, resuming on the original dispatcher when done.

Kotlin Practice Test