如何立即从范围内取消（返回）Kotlin 协程？

Question

In the following code I want to stop the execution of this scope when an exception was caught.

GlobalScope.launch() {
   try {
       someFunctionThatThrows()
   } catch (exception: Exception) {
       // log
       cancel() // this is not stopping the coroutine and moreWork() is still executed
   }
   moreWork()
}

cancel() does not cancel the coroutine immediately but instead sets the flag isActive to false, which requires subsequent checking.

Answer 1

There is special syntax return@launch , return@async etc. depending on which scope you have launched

GlobalScope.launch() {
   try {
       someFunctionThatThrows()
   } catch (exception: Exception) {
       // log
       return@launch 
   }
   moreWork()
}

return@async can also have an actual return value that is passed into it's Deferred<T> val.

val deferredValue = GlobalScope.async() { return@aysnc "hello world" }