Platform

Returns a Reader that buffers elements produced by upstream into a bounded buffer of size bufferSize. On JVM, the producer runs on a separate virtual thread (concurrent). On JS, the reader prefetches elements synchronously.

Returns a Reader that applies f to each element of upstream using n concurrent workers. On JVM, workers run on virtual threads. On JS, degrades to sequential map.

Returns a Reader that merges elements from N inner streams produced by outerReader, up to maxOpen concurrent inner streams at a time. On JVM, producers run on virtual threads. On JS, degrades to sequential flatMap.

Starts a new thread and runs task on it. Returns the started thread (which can be java.lang.Thread#joined). On JVM, uses a virtual thread (JDK 21+) if available, otherwise a raw daemon thread. On Scala.js, always throws UnsupportedOperationException.

Whether this platform supports true concurrent threads. true on JVM, false on Scala.js.