LeftProjection

final case class LeftProjection[+A, +B](e: Either[A, B])

Projects an Either into a Left.

See also:
Source:
Either.scala
trait Product
trait Equals
class Object
trait Matchable
class Any

Value members

Concrete methods

def exists(p: A => Boolean): Boolean

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
Source:
Either.scala
def filterToOption[B1](p: A => Boolean): Option[Either[A, B1]]

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.filterToOption(_ > 10)  // Some(Left(12))
Left(7).left.filterToOption(_ > 10)   // None
Right(12).left.filterToOption(_ > 10) // None
Source:
Either.scala
def flatMap[A1, B1 >: B](f: A => Either[A1, B1]): Either[A1, B1]

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)
Value parameters:
f

The function to bind across Left.

Source:
Either.scala
def forall(p: A => Boolean): Boolean

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
Source:
Either.scala
def foreach[U](f: A => U): Unit

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
Value parameters:
f

The side-effecting function to execute.

Source:
Either.scala
def getOrElse[A1 >: A](or: => A1): A1

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
Source:
Either.scala
def map[A1](f: A => A1): Either[A1, B]

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)
Source:
Either.scala

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
Source:
Either.scala
def toSeq: Seq[A]

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()
Source:
Either.scala

Deprecated methods

@deprecated("Use `filterToOption`, which more accurately reflects the return type", "2.13.0")
def filter[B1](p: A => Boolean): Option[Either[A, B1]]

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
Deprecated
Source:
Either.scala
@deprecated("use `Either.swap.getOrElse` instead", "2.13.0")
def get: A

Returns the value from this Left or throws NoSuchElementException if this is a Right.

Returns the value from this Left or throws NoSuchElementException if this is a Right.

Left(12).left.get  // 12
Right(12).left.get // NoSuchElementException
Throws:
NoSuchElementException

if the projection is scala.util.Right

Deprecated
Source:
Either.scala

Inherited methods

An iterator over the names of all the elements of this product.

An iterator over the names of all the elements of this product.

Inherited from:
Product
Source:
Product.scala

An iterator over all the elements of this product.

An iterator over all the elements of this product.

Returns:

in the default implementation, an Iterator[Any]

Inherited from:
Product
Source:
Product.scala