Mouse

scala>importmouse.all._importmouse.all._
scala>true.option("Its true!")
res0:Option[String] =Some(Itstrue!)
scala>defmakeEven(i: Int) = (i %2==1).applyIf(i)(_ -1)
defmakeEven(i: Int):Int
scala>vale1:Either[String, Int] =Left("failed")
e1:Either[String,Int] =Left(failed)
scala>true.whenA(e1)
res0:Either[String,Unit] =Left(failed)
scala>false.whenA(e1)
res1:Either[String,Unit] =Right(())
scala> res0.cata(msg =>s"Message received: ${msg}", "No message")
res1:String=Messagereceived: Itstrue!
scala>"1.0".parseFloat
res0:Either[NumberFormatException, Float] =Right(1.0F)
scala>"foo".parseIntValidated
res1: cats.data.Validated[NumberFormatException,Int] =Invalid(java.lang.NumberFormatException:For input string: "foo")
scala>valt1= scala.util.Try(new java.net.URL("https://www.github.com"))
t1: scala.util.Try[java.net.URL] =Success(https://www.github.com)
scala> t1.cata(msg =>s"URL is valid!", error =>s"URL is invalid: ${error.getMessage}")
res1:String=URL is valid!
scala> t1.toEither
res2:Either[Throwable,java.net.URL] =Right(https://www.github.com)
scala>valt2= scala.util.Try(new java.net.URL("https//www.github.com"))
t2: scala.util.Try[java.net.URL] =Failure(java.net.MalformedURLException: no protocol: https//www.github.com)
scala> t2.cata(msg =>s"URL is valid!", error =>s"URL is invalid: ${error.getMessage}")
res3:String=URL is invalid: no protocol: https//www.github.com
scala> t2.toEither
res4:Either[Throwable,java.net.URL] =Left(java.net.MalformedURLException: no protocol: https//www.github.com)
scala>valintToBytes=123456789.toByteArray
intToBytes:Array[Byte] =Array(7, 91, -51, 21)
scala>vallongToBase64=123456789L.toBase64
longToBase64:String=AAAAAAdbzRU
scala>5.squared
res0:Int=25
scala>1.5|> (_.toInt) |> (_.toString)
res0:String=1//lift a partial function into a total function to an Either, when you want to treat unhandled input cases as an error
scala> liftEither[Option[Int]]({caseSome(n) => n}, a =>s"Unexpected: $a")(Some(6))
res0:Either[String,Int] =Right(6)
scala>valmapped=Map(1->2, 3->4).mapKeys(_ *2)
mapped:Map[Int,Int] =Map(2->2, 6->4)
scala>valfoption=List(Option(1), Option(2), Option(4)).mapIn(_ *2)
foption:List[Option[Int]] =List(Some(2), Some(4), Some(8))
scala>valfeither=List(Either.cond(true, 1, "0")).mapIn(_ *2)
feither:List[Either[String, Int]] =List(Right(2))
scala>vallistOption=List(Option(1), Option(2)).mapNested2(_ *2)
listOption:List[Option[Int]] =List(Some(2), Some(4))
scala>vallistOptionList=List(Option(List(1)), Option(List(2))).mapNested3(_ *2)
listOptionList:List[Option[List[Int]]] =List(Some(List(2)), Some(List(4)))
scala>valtupleHead= (1, 2, 4, 8).head
tupleHead:Int=1
scala>valtupleLast= (1, 2, 4, 8).last
tupleLast:Int=8
scala>Set(0).tailOrEmpty
valres3:Set[Int] =Set()
scala>Nil.tailOrEmpty
valres1:List[Nothing] =List()
scala>Set(0).tailOption
valres4:Option[cats.data.NonEmptySet[Int]] =None
scala>List(0,1,2).tailOption
valres5:Option[cats.data.NonEmptyList[Int]] =Some(NonEmptyList(1, 2))