'map { it.await() }' call on 'Collection<Deferred>' instead of single 'awaitAll()'

Reports map { it.await() } calls on collections of Deferred.

This can be replaced by a more concise and potentially more efficient awaitAll() call.

See the documentation for kotlinx.coroutines.awaitAll for more details.

Example:

  suspend fun waitForResult(results: List<Deferred<String>>): List<String> {
    return results.map { it.await() }
  }

After the quick-fix is applied:

  suspend fun waitForResult(results: List<Deferred<String>>): List<String> {
    return results.awaitAll()
  }

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

MapAwaitOnCollectionOfDeferred

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Kotlin | Coroutine inspections

Inspection ID: MapAwaitOnCollectionOfDeferred

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection MapAwaitOnCollectionOfDeferred

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025