What Java 8 Stream.collect equivalents are available in the standard Kotlin library?

Question

In Java 8, there is Stream.collect which allows aggregations on collections. In Kotlin, this does not exist in the same way, other than maybe as a collection of extension f

Answer 1

There are some cases where it is hard to avoid calling collect(Collectors.toList()) or similar. In those cases, you can more quickly change to a Kotlin equivalent using extension functions such as:

fun  Stream.toList(): List = this.collect(Collectors.toList())
fun  Stream.asSequence(): Sequence = this.iterator().asSequence()

Then you can simply stream.toList() or stream.asSequence() to move back into the Kotlin API. A case such as Files.list(path) forces you into a Stream when you may not want it, and these extensions can help you to shift back into the standard collections and Kotlin API.