SharedFlow for event broadcasting in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a MutableSharedFlow instance.

Kotlin

val eventFlow = MutableSharedFlow<[1]>()

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ADouble

BInt

CString

DBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using a type that does not match the event data.

Forgetting to specify the generic type.

We create a MutableSharedFlow to broadcast events of type String.

2fill in blank

medium

Complete the code to emit an event into the SharedFlow.

Kotlin

suspend fun sendEvent(event: String) {
    eventFlow.[1](event)
}

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Acollect

Bemit

Claunch

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using collect which is for receiving events.

Using launch which is for coroutines, not flows.

Use emit to send an event to the SharedFlow.

3fill in blank

hard

Fix the error in collecting events from the SharedFlow.

Kotlin

suspend fun observeEvents() {
    eventFlow.[1] { event ->
        println("Received: $event")
    }
}

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Acollect

Bemit

Csend

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using emit which is for sending events.

Using subscribe which is not a Kotlin Flow method.

Use collect to receive events from a SharedFlow.

4fill in blank

hard

Fill both blanks to create a SharedFlow with replay and buffer capacity.

Kotlin

val bufferedFlow = MutableSharedFlow<String>(replay = [1], extraBufferCapacity = [2])

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A1

B0

C2

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Setting replay or buffer to zero when some buffering is needed.

Confusing replay and buffer parameters.

Replay 1 event and buffer 2 extra events for smooth broadcasting.

5fill in blank

hard

Fill all three blanks to filter and map events in a SharedFlow.

Kotlin

val filteredFlow = eventFlow
    .filter { it.length [1] [2] }
    .map { it.[3]() }

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A>

B3

Cuppercase

Dlowercase

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Using a non-existent string method.

Filter events longer than 3 characters and convert them to lowercase.