My use case is this: given an incoming data stream, I want to provide a stream to the user consisting of the accumulated data stream, so ["lorem", "ipsum", "dolor"] would become ["lorem", "lorem ipsum", "lorem ipsum dolor"].
The currently implementation of StreamExt::scan makes this less ergonomic than is ideal, because I need to wrap everything in Some().
In addition, if I want the stream's entries to be Result<Foo>, and I want to unwrap the Err variant in one scan iteration, I can't use ? shorthand.
This feels a bit like scan should actually be named filter_scan, much like how map and filter_map are the non-Option and Option versions of each other.
My use case is this: given an incoming data stream, I want to provide a stream to the user consisting of the accumulated data stream, so
["lorem", "ipsum", "dolor"]would become["lorem", "lorem ipsum", "lorem ipsum dolor"].The currently implementation of
StreamExt::scanmakes this less ergonomic than is ideal, because I need to wrap everything inSome().In addition, if I want the stream's entries to be
Result<Foo>, and I want to unwrap theErrvariant in onescaniteration, I can't use?shorthand.This feels a bit like
scanshould actually be namedfilter_scan, much like howmapandfilter_mapare the non-Option and Option versions of each other.