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Add some more implementations to Function0 and Function1 Monads #3515

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merged 3 commits into from
Jul 13, 2020
Merged

Add some more implementations to Function0 and Function1 Monads #3515

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6aa4f79
Add some more implementations to Function0 and Function1 Monads
johnynek Jul 11, 2020
24c6cd4
fix dotty compilation
johnynek Jul 12, 2020
9185231
address review comments
johnynek Jul 12, 2020
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21 changes: 21 additions & 0 deletions core/src/main/scala/cats/instances/function.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,18 @@ sealed private[instances] trait Function0Instances extends Function0Instances0 {

def pure[A](x: A): () => A = () => x

override def map[A, B](fa: () => A)(fn: A => B): () => B =
() => fn(fa())

override def map2[A, B, C](fa: () => A, fb: () => B)(fn: (A, B) => C): () => C =
() => fn(fa(), fb())

override def product[A, B](fa: () => A, fb: () => B): () => (A, B) =
() => (fa(), fb())

override def ap[A, B](f: () => A => B)(fa: () => A): () => B =
() => f()(fa())

def flatMap[A, B](fa: () => A)(f: A => () => B): () => B =
() => f(fa())()

Expand Down Expand Up @@ -122,6 +134,15 @@ sealed private[instances] trait Function1Instances extends Function1Instances0 {
override def map[R1, R2](fa: T1 => R1)(f: R1 => R2): T1 => R2 =
f.compose(fa)

override def map2[A, B, C](fa: T1 => A, fb: T1 => B)(fn: (A, B) => C): T1 => C =
t => fn(fa(t), fb(t))

override def product[A, B](fa: T1 => A, fb: T1 => B): T1 => (A, B) =
t => (fa(t), fb(t))

override def ap[A, B](f: T1 => A => B)(fa: T1 => A): T1 => B =
t => f(t).apply(fa(t))

def tailRecM[A, B](a: A)(fn: A => T1 => Either[A, B]): T1 => B =
(t: T1) => {
@tailrec
Expand Down