In Scala
Either, functions exactly similar to an
Option. The only dissimilarity is that with Either it is practicable to return a string which can explicate the instructions about the error that appeared. The
Either has two children which are named as
Right and
Left where,
Right is similar to the
Some class and
Left is same as
None class. Left is utilized for the failure where, we can return the error occurred inside the child Left of the Either and Right is utilized for Success.
Example:
Either[String, Int]
Here, the
String is utilized for the
Left child of Either as its the left argument of an Either and
Int is utilized for the
Right child as its the right argument of an Either. Now, let's discuss it in details with the help of some examples.
-
Example :
Output:
Right(GeeksforGeeks)
Left(There is no name.)
Here, isEmpty method checks if the field of name is empty or filled, if its empty then Left child will return the String inside itself and if this field is not empty then the Right child will return the name stated.
-
Example :
Here, the division is possible which implies success so, Right returns 2. Here, we have utilized Pattern Matching in this example of Either.
