Question

I’m splitting an input of type Option[String] into an Option[Array[String]] as follows:

val input:Option[String] = Option("a=b,1000,what?")
val result: Option[Array[String]] = input map { _.split(",") }

I want to add a test whereby if any member of the array matches (eg, is an Long less than 0), the whole array is discarded and an empty Option returned.

Answer 1

1. Use filter to perform a test on the content of an Option.
2. Use exists to check whether any member of the collection fullfils a condition.

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result.filter(! _.exists(s => test(s)))

or

result.filterNot(_.exists(s => test(s)))