Why the last line prints

false

if the line before it prints

1

?

val flow = MutableStateFlow(2)
val flowB: StateFlow<Boolean> = flow
    .map { it == 1 }
    .stateIn(GlobalScope, SharingStarted.Eagerly, false)

println(flow.value) // 2
flow.value = 1
println(flow.value) // 1
println(flowB.value) // false

The flow is asynchronous. When you emit 1 in

flow

, there is some time before

flowB

picks collects the value from

flow

, maps it and emits it. Your

println

statements are executed in that time, after 1 is emitted by

flow

but before 1 is collected by

flowB

. You can run

flowB

on an

Unconfined

dispatcher to make it process the value as soon as it is emitted by

flow

.

.stateIn(GlobalScope + Dispatchers.Unconfined