LeftProjection

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.

Left(12).left.filterToOption(_ > 10)  // Some(Left(12))
Left(7).left.filterToOption(_ > 10)   // None
Right(12).left.filterToOption(_ > 10) // None

Binds the given function across Left.

Left(12).left.flatMap(x => Left("scala")) // Left("scala")
Right(12).left.flatMap(x => Left("scala")) // Right(12)

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.

Left(12).left.foreach(x => println(x))  // prints "12"
Right(12).left.foreach(x => println(x)) // doesn't print

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.

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.

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.

Left(12).left.toSeq // Seq(12)
Right(12).left.toSeq // Seq()

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

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

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