Mastering Kotlin Coroutines/

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Coroutine Builders: Using coroutineScope

Coroutine Builders: Using coroutineScope

Learn to use coroutineScope and get a summary of coroutine builders.

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Imagine that in some repository function, we need to asynchronously load two resources—for example, user data and a list of articles. In this case, we want to return only those articles that the user should see. To call async, we need a scope, but we don’t want to pass it to a function. To create a scope out of a suspending function, we use the coroutineScope function.

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suspend fun getArticlesForUser( 
    userToken: String?,
): List<ArticleJson> = coroutineScope {
    val articles = async { articleRepository.getArticles() } 
    val user = userService.getUser(userToken) 
    articles.await()
        .filter { canSeeOnList(user, it) }
        .map { toArticleJson(it) }
}

The suspending function coroutineScope creates a scope for its lambda expression. The function returns whatever the lambda expression ...