public static void Test()
{
int[] someInts = new int[] { 1, 2, 3, 17, 34 };
Dictionary <long, bool> is_odd_lookup_2
= someInts.ToDictionary(GetKey, IsOdd);
Dictionary <int, bool> is_odd_lookup_1
= someInts.ToDictionary(i => i, i => i % 2 == 1);
Lesson_1_testing.Ensure_correct(is_odd_lookup_1);
Lesson_1_testing.Ensure_correct(is_odd_lookup_2);
// note how the key types are different for illustration - A* pedagog!
}
public static void Test()
{
int[] someInts = new int[] { 1, 2, 3, 17, 34 };
Dictionary <string, bool> is_odd_lookup_1
= someInts.ToDictionary(
keySelector: i => $"{i}",
valueSelector: i => i % 2 == 1
);
Dictionary <string, bool> is_odd_lookup_2
= someInts.ToDictionary(GetKey, IsOdd);
// Note how we used both "function pointers"
// and lambdas for key and value selectors.
// Either of those works as a Func<>.
// (of course also delegates)
Lesson_1_testing.Ensure_correct(is_odd_lookup_1);
Lesson_1_testing.Ensure_correct(is_odd_lookup_2);
}