if a scala function is
def A(): Either[Exception, ArrayBuffer[Int]] = {
...
}
what should be the right way to process the returned result?
val a = A()
and ?
I generally prefer using fold
. You can use it like map:
scala> def a: Either[Exception,String] = Right("On")
a.fold(l => Left(l), r => Right(r.length))
res0: Product with Either[Exception,Int] = Right(2)
Or you can use it like a pattern match:
scala> a.fold( l => {
| println("This was bad")
| }, r => {
| println("Hurray! " + r)
| })
Hurray! On
Or you can use it like getOrElse
in Option
:
scala> a.fold( l => "Default" , r => r )
res2: String = On