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arjanblokzijl/gist:1278729

Created October 11, 2011 17:20
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most basic monad state transformer example
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gistfile1.scala
scala> for (s <- stateT[Int, Option, String](i => Some(("aaa", i + 1)))) yield(s + "bbb")
res0: scalaz.StateT[Int,Option,java.lang.String] = scalaz.StateTs$$anon$1@4f837a5b
scala> res0.runT(10)
res31: Option[(java.lang.String, Int)] = Some((aaabbb,11))
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