Returns false if Right or returns the result of the application of
the given function to the Left value.
Returns false if Right or returns the result of the application of
the given function to the Left value.
Left(12).left.exists(_ > 10) // true Left(7).left.exists(_ > 10) // false Right(12).left.exists(_ > 10) // false
Returns None if this is a Right or if the given predicate
p does not hold for the left value, otherwise, returns a Left.
Returns None if this is a Right or if the given predicate
p does not hold for the left value, otherwise, returns a Left.
Left(12).left.filter(_ > 10) // Some(Left(12)) Left(7).left.filter(_ > 10) // None Right(12).left.filter(_ > 10) // None
Binds the given function across Left.
Binds the given function across Left.
Left(12).left.flatMap(x => Left("scala")) // Left("scala") Right(12).left.flatMap(x => Left("scala") // Right(12)
The function to bind across Left.
Returns true if Right or returns the result of the application of
the given function to the Left value.
Returns true if Right or returns the result of the application of
the given function to the Left value.
Left(12).left.forall(_ > 10) // true Left(7).left.forall(_ > 10) // false Right(12).left.forall(_ > 10) // true
Executes the given side-effecting function if this is a Left.
Executes the given side-effecting function if this is a Left.
Left(12).left.foreach(x => println(x)) // prints "12" Right(12).left.foreach(x => println(x)) // doesn't print
The side-effecting function to execute.
Returns string formatted according to given format string.
Returns string formatted according to given format string.
Format strings are as for String.format
(@see java.lang.String.format).
Returns the value from this Left or throws Predef.NoSuchElementException
if this is a Right.
Returns the value from this Left or throws Predef.NoSuchElementException
if this is a Right.
Left(12).left.get // 12 Right(12).left.get // NoSuchElementException
if the projection is scala.util.Right
Returns the value from this Left or the given argument if this is a
Right.
Returns the value from this Left or the given argument if this is a
Right.
Left(12).left.getOrElse(17) // 12 Right(12).left.getOrElse(17) // 17
Maps the function argument through Left.
Maps the function argument through Left.
Left(12).left.map(_ + 2) // Left(14) Right[Int, Int](12).left.map(_ + 2) // Right(12)
Returns a Some containing the Left value if it exists or a
None if this is a Right.
Returns a Some containing the Left value if it exists or a
None if this is a Right.
Left(12).left.toOption // Some(12) Right(12).left.toOption // None
Returns a Seq containing the Left value if it exists or an empty
Seq if this is a Right.
Returns a Seq containing the Left value if it exists or an empty
Seq if this is a Right.
Left(12).left.toSeq // Seq(12) Right(12).left.toSeq // Seq()
Projects an
Eitherinto aLeft.This allows for-comprehensions over Either instances - for example
Continuing the analogy with scala.Option, a
LeftProjectiondeclares thatLeftshould be analogous toSomein some code.1.0, 11/10/2008