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DocTests for OptionT #4038

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merged 6 commits into from
Jan 31, 2022
Merged

DocTests for OptionT #4038

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a4647bc
OptionT doctests
FelAl Nov 7, 2021
d337234
OptionT, doctests, indentation fix
FelAl Nov 8, 2021
ac818dc
Merge branch 'main' into IS2479
FelAl Nov 17, 2021
dd7bf33
collect fix
FelAl Nov 22, 2021
1435f45
comments fixes
FelAl Nov 22, 2021
371c963
fixes
FelAl Jan 19, 2022
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112 changes: 112 additions & 0 deletions core/src/main/scala/cats/data/OptionT.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,16 @@ final case class OptionT[F[_], A](value: F[Option[A]]) {
def cataF[B](default: => F[B], f: A => F[B])(implicit F: FlatMap[F]): F[B] =
foldF(default)(f)

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.map(_.toString + "!")
* res0: OptionT[List, String] = OptionT(value = List(Some(value = "2!"), None, Some(value = "414!"), None, None))
* }}}
*/
def map[B](f: A => B)(implicit F: Functor[F]): OptionT[F, B] =
OptionT(F.map(value)(_.map(f)))

Expand Down Expand Up @@ -101,30 +111,109 @@ final case class OptionT[F[_], A](value: F[Option[A]]) {
def getOrElseF[B >: A](default: => F[B])(implicit F: Monad[F]): F[B] =
F.flatMap(value)(_.fold(default)(F.pure))

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.collect(_ == 2)
* res0: OptionT[List, Boolean] = OptionT(value = List(Some(value = true), None, Some(value = false), None, None))
* }}}
*/
def collect[B](f: PartialFunction[A, B])(implicit F: Functor[F]): OptionT[F, B] =
OptionT(F.map(value)(_.collect(f)))

def exists(f: A => Boolean)(implicit F: Functor[F]): F[Boolean] =
F.map(value)(_.exists(f))

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.filter(el => (el % 2 ==0 ))
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No big deal, but the whitespace on these is a bit weird:

Suggested change
* scala> optionT.filter(el => (el % 2 ==0 ))
* scala> optionT.filter(el => (el % 2 == 0))

* res0: OptionT[List, Int] = OptionT(value = List(Some(value = 2), None, Some(value = 414), None, None))
*
* scala> optionT.filter(el => (el % 3 ==0 ))
* res1: OptionT[List, Int] = OptionT(value = List(None, None, Some(value = 414), None, None))
* }}}
*/
def filter(p: A => Boolean)(implicit F: Functor[F]): OptionT[F, A] =
OptionT(F.map(value)(_.filter(p)))

/**
* Example:
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* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.withFilter(el => (el % 2 ==0 ))
* res0: OptionT[List, Int] = OptionT(value = List(Some(value = 2), None, Some(value = 414), None, None))
*
* scala> optionT.withFilter(el => (el % 3 ==0 ))
* res1: OptionT[List, Int] = OptionT(value = List(None, None, Some(value = 414), None, None))
* }}}
*/
def withFilter(p: A => Boolean)(implicit F: Functor[F]): OptionT[F, A] =
filter(p)(F)

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.filterNot(el => (el % 2 ==0 ))
* res0: OptionT[List, Int] = OptionT(value = List(None, None, None, None, None))
*
* scala> optionT.filterNot(el => (el % 3 ==0 ))
* res1: OptionT[List, Int] = OptionT(value = List(Some(value = 2), None, None, None, None))
* }}}
*/
def filterNot(p: A => Boolean)(implicit F: Functor[F]): OptionT[F, A] =
OptionT(F.map(value)(_.filterNot(p)))

def forall(f: A => Boolean)(implicit F: Functor[F]): F[Boolean] =
F.map(value)(_.forall(f))

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.isDefined
* res0: List[Boolean] = List(true, false, true, false, false)
* }}}
*/
def isDefined(implicit F: Functor[F]): F[Boolean] =
F.map(value)(_.isDefined)

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.isEmpty
* res0: List[Boolean] = List(false, true, false, true, true)
* }}}
*/
def isEmpty(implicit F: Functor[F]): F[Boolean] =
F.map(value)(_.isEmpty)

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.orElseF(List[Option[Int]](Some(-1)))
* res0: OptionT[List, Int] = OptionT(value = List(Some(value = 2), Some(value = -1), Some(value = 414), Some(value = -1), Some(value = -1))
* }}}
*/
def orElse(default: => OptionT[F, A])(implicit F: Monad[F]): OptionT[F, A] =
orElseF(default.value)

Expand All @@ -146,8 +235,31 @@ final case class OptionT[F[_], A](value: F[Option[A]]) {
def toLeftF[R](right: => F[R])(implicit F: Monad[F]): EitherT[F, A, R] =
EitherT(cataF(F.map(right)(Right.apply[A, R]), a => F.pure(Left(a))))

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.show
* res0: String = "List(Some(2), None, Some(414), None, None)"
* }}}
*/
def show(implicit F: Show[F[Option[A]]]): String = F.show(value)

/**
* Example:
* {{{
* scala> import cats.data.OptionT
*
* scala> val optionT: OptionT[List, Int] = OptionT(List(Some(2), None, Some(414), None, None))
* scala> optionT.compare(OptionT[List, Int](List(Some(2))))
* res0: Int = 1
*
* scala> optionT.compare(OptionT[List, Int](List(Some(2), None, Some(414), None, None)))
* res0: Int = 0
* }}}
*/
def compare(that: OptionT[F, A])(implicit o: Order[F[Option[A]]]): Int =
o.compare(value, that.value)

Expand Down