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jdegoes/whatif.scala

Created March 17, 2014 22:07
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StateT combinator
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whatif.scala
def whatif[S, A](f: StateT[M, S, A]): StateT[M, S, A] = {
for {
oldState <- read(identity[S])
rez <- f.imap(Function.const(oldState))
} yield rez
}
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