To implement the map
function on Kotlin's StateFlow, you can use the map
operator provided by the kotlinx.coroutines.flow
package. Here is an example:
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.StateFlow
val inputStateFlow: StateFlow<Int> = ...
val outputStateFlow: StateFlow<String> = inputStateFlow.map { input ->
// transform input into a string
input.toString()
}
In this example, inputStateFlow
is an existing StateFlow<Int>
. We create a new outputStateFlow
that maps each integer value emitted by inputStateFlow
into a string using the provided lambda expression.
The map
operator returns a new StateFlow
that emits the transformed values. outputStateFlow
will emit the same number of items as inputStateFlow
, but each item will be a string.
Note that the state of outputStateFlow
is not stored internally. It is recomputed each time the state of inputStateFlow
changes.
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Asked: 2021-05-05 11:00:00 +0000
Seen: 17 times
Last updated: Mar 11 '22
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