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added doctest for forall and exists #4841

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Merged
LukaJCB merged 2 commits into from
Mar 8, 2026
Merged

added doctest for forall and exists #4841

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6d85179
added doctest for forall and exists
loladenney Mar 8, 2026
0b7a2d5
Update core/src/main/scala/cats/data/NonEmptyList.scala
loladenney Mar 8, 2026
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16 changes: 16 additions & 0 deletions core/src/main/scala/cats/data/NonEmptyList.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -280,12 +280,28 @@ final case class NonEmptyList[+A](head: A, tail: List[A]) extends NonEmptyCollec

/**
* Check whether at least one element satisfies the predicate
* {{{
* scala> import cats.data.NonEmptyList
* scala> val nel = NonEmptyList.of(1, 2, 3, 4, 5)
* scala> nel.exists(i => i > 100)
* res0: scala.Boolean = false
* scala> nel.exists(i => i > 2)
* res1: scala.Boolean = true
* }}}
*/
def exists(p: A => Boolean): Boolean =
p(head) || tail.exists(p)

/**
* Check whether all elements satisfy the predicate
* {{{
* scala> import cats.data.NonEmptyList
* scala> val nel = NonEmptyList.of(1, 2, 3, 4, 5)
* scala> nel.forall(_ > 0)
* res0: scala.Boolean = true
* scala> nel.forall(i => i > 2)
* res1: scala.Boolean = false
* }}}
*/
def forall(p: A => Boolean): Boolean =
p(head) && tail.forall(p)
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