Accept Suspend and Non-Suspend as Parameter in Kotlin

Kotlin as always comes with a smart and simple solution. 😀 Check out this tip!

Instead of creating two analogous functions just to be able to provide both suspend and regular functions as parameters, like so:


fun doSomethingBeforeAndAfter(
 nonSuspendAction: () -> Unit
) {
  somethingBeforeAction()
  nonSuspendAction()
  somethingAfterAction()
}

suspend fun doSomethingBeforeAndAfterForSuspendableActions(
 suspendAction: suspend () -> Unit
) {
  somethingBeforeAction()
  suspendAction()
  somethingAfterAction()
}


If you can define your function as ‘inline’, it will also make it accept both suspend and non-suspend functions as parameters:


inline fun doSomethingBeforeAndAfter(
 action: () -> Unit
) {
  somethingBeforeAction()
  action()
  somethingAfterAction()
}


Check out our repo! Hope you enjoyed this Kotlin tip. 🙂

---

By Łukasz Reszetow, Android Developer @ Bright Inventions