Finding elements in a scala list and also know which predicate has been satisfied

Question

I have the following problem in scala. I have to find the first element in al list which satisfies a predicate function with two conditions in OR. The problem is that I would li

Answer 1

I'd do this:

Scala 2.8:

def find2p[T](l: List[T], p1: T => Boolean, p2: T => Boolean) = 
  l.view.map(el => (el, p1(el), p2(el))).find(t => t._2 || t._3)

Scala 2.7:

def find2p[T](l: List[T], p1: T => Boolean, p2: T => Boolean) = 
  l.projection.map(el => (el, p1(el), p2(el))).find(t => t._2 || t._3)

The view/projection ensures that the mapping will be done on-demand, instead of being applied to the whole list.