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Added examples of Arrow composition #1952

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merged 9 commits into from
Oct 10, 2017
Merged

Added examples of Arrow composition #1952

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fb60456
Example for beginners to use Arrow composition
Oct 7, 2017
961c1e3
Merge branch 'master' of https://github.com/typelevel/cats
Oct 7, 2017
604b71e
Example for beginners to use Arrow composition
Oct 7, 2017
6f6b09e
Got rid of whitespace at EOL
Oct 8, 2017
4c417aa
Merge branch 'master' of https://github.com/raymondtay/cats
raymondtay Oct 9, 2017
7adc57d
Added type signatures
raymondtay Oct 9, 2017
88abe61
Merge branch 'master' of https://github.com/typelevel/cats
Oct 10, 2017
ba82d30
Merge branch 'master' of https://github.com/raymondtay/cats
Oct 10, 2017
bcbd847
Got rid of the unused import that is borking the build
raymondtay Oct 10, 2017
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14 changes: 14 additions & 0 deletions core/src/main/scala/cats/arrow/Compose.scala
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Expand Up @@ -8,6 +8,20 @@ import simulacrum.typeclass
*/
@typeclass trait Compose[F[_, _]] { self =>

/**
* Here's how you can use `>>>` and `<<<`
* Example:
* {{{
* scala> import cats.implicits._
* scala> import cats.arrow._
* scala> val f = (_ + 1)
* scala> val g = (_ * 100)
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the above two lines don't compile

/home/travis/build/typelevel/cats/core/.jvm/target/scala-2.10/src_managed/test/cats/arrow/ComposeDoctest.scala:20: missing parameter type for expanded function

* scala> (f >>> g)(3)
* res0: Int = 400
* scala> (f <<< g)(3)
* res1: Int = 301
* }}}
*/
@simulacrum.op("<<<", alias = true)
def compose[A, B, C](f: F[B, C], g: F[A, B]): F[A, C]

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