def testExists (self):
self.assertEquals (False, Nil.exists (lambda x: x == 0))
self.assertEquals (True, List (1, 2, 3).exists (lambda x: x % 2 == 0))
self.assertEquals (True, List (1, 2, 3, 4, 5).exists (_ % 2 == 0))
self.assertEquals (False, List (1, 2, 3, 4, 5).exists (_ > 10))
pass
