What popular patterns of using Flow inside coroutines do you know?

Flow in Kotlin Coroutines is often used for asynchronous data stream processing. Popular usage patterns include:

• Cold Stream: Flow is created and starts emitting values only upon subscription. This is convenient for lazy data loading.

• StateFlow: a specialized Flow for storing and propagating state. Used for reactive UI, where the state is updated and subscribers receive the latest data.

• SharedFlow: similar to StateFlow, but allows broadcasting events without storing state, useful for one-time events (e.g., navigation, messages).

• Flow Operators: map, filter, debounce, combine, and other operators for transforming and combining streams.

• Collect in coroutines: to receive values from Flow, the collect operator is used inside a coroutine.

Example of using StateFlow:

class ViewModel {
    private val _state = MutableStateFlow(0)
    val state: StateFlow<Int> = _state

    fun increment() {
        _state.value += 1
    }
}

// In UI
lifecycleScope.launch {
    viewModel.state.collect { value ->
        textView.text = value.toString()
    }
}