The problem

I want to exclude a bunch of Nones

The solution

The .collect method allows you to apply a partial function to the value inside a Valid instance and accumulate errors in case the partial function is not defined for the given value. If the partial function is defined and produces a value, it returns a new Valid instance with the transformed value.

For instance, you can use collect on an Option to achieve filtering based on some condition while excluding None values:

Copycopy code to clipboard
val optionList: List[Option[Int]] = List(Some(1), None, Some(2), None, Some(3))
val filteredValues: List[Int] = optionList.collect { case Some(value) => value }

println(filteredValues) // Output: List(1, 2, 3)