Creating Flows with Flow builders

In this section, we will start by looking at creating Flows. To create a Flow, you can use a Flow builder.

The Kotlin Flow API has flow builders that you can use to create Flows. The following are the Kotlin Flow builders you can use:

• flow {}
• flowOf()
• asFlow()

The flow builder function creates a new Flow from a suspendable lambda block. Inside the block, you can send values using the emit function. For example, this fetchMovieTitles function of MovieViewModel returns Flow<String>:

class MovieViewModel : ViewModel() {

    ...

    fun fetchMovieTitles(): Flow<String> = flow {

        val movies = fetchMoviesFromNetwork()

        movies.forEach { movie -> 

            emit(movie.title)

    &...