Created
February 5, 2022 04:37
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Set is not a functor
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| scala> import org.typelevel.ci._ | |
| import org.typelevel.ci._ | |
| scala> val f: String => CIString = CIString.apply | |
| val f: String => org.typelevel.ci.CIString = $Lambda$1025/2055291664@4bbf38b8 | |
| scala> val g: CIString => String = _.toString | |
| val g: org.typelevel.ci.CIString => String = $Lambda$1027/1152113439@62108cd3 | |
| scala> val rosses = Set("Ross", "ROSS", "ross") // three too many if you ask me | |
| val rosses: scala.collection.immutable.Set[String] = Set(Ross, ROSS, ross) | |
| scala> rosses.map(f).map(g) | |
| val res0: scala.collection.immutable.Set[String] = Set(Ross) | |
| scala> rosses.map(f andThen g) | |
| val res1: scala.collection.immutable.Set[String] = Set(Ross, ROSS, ross) |
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