Created
August 23, 2018 13:28
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copy/paste into ammonite REPL to run : http://ammonite.io/#Ammonite-REPL
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| import $ivy.`co.fs2:fs2-core_2.12:0.10.5` , fs2._ | |
| def dedupeConsecutiveWhen[F[_], I](f: (I, I) => Boolean): Pipe[F, I, I] = in => | |
| in.zipWithNext.map { | |
| case (curr, Some(next)) if f(curr, next) => (None: Option[I]) | |
| case (curr, Some(next)) => Some(curr) | |
| case (curr, None) => Some(curr) | |
| }.unNone | |
| Stream(1,1,2,2,3,4,5,2).through(dedupeConsecutiveWhen(_ == _ )).toList |
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