public static ListArrow <A, C> Combine <A, B, C>(this ListArrow <A, B> a1, ListArrow <B, C> a2)
{
/*
* Combine arrows end-to-end. This is an overloaded version of the normal Arrow.Combine
* method used to prevent ListArrows being prematurely converted into arrows between
* IEnumerables.
*/
ListArrow <A, C> result = new ListArrow <A, C>(
x => a2.Invoke(a1.Invoke(x))
);
return(result);
}
public static void DemoListArrows()
{
List <String> cities = new List <String> {
"London",
"Edinburgh",
"Newcastle",
"Manchester",
"Glasgow",
"Cambridge"
};
ListArrow <String, String> sorter = ListArrow.Map((String x) => Tuple.Create(x, x.Length))
.Combine(ListArrow.OrderBy <Tuple <String, int> >((s1, s2) => s1.Item2 - s2.Item2)
.Combine(ListArrow.Map((Tuple <String, int> x) => x.Item1)))
.Combine(ListArrow.Filter((String x) => x.IndexOf('E') != 0));
var result = sorter.Invoke(cities);
foreach (var s in result)
{
Console.WriteLine(s);
}
Console.WriteLine();
ListArrow <String, String> cityArrow =
ListArrow.Map((String city) => Tuple.Create(city, city.Length))
.Filter((Tuple <String, int> cityTuple) => cityTuple.Item2 > 7)
.Map((Tuple <String, int> cityTuple) => cityTuple.Item1)
.Filter((String city) => city != "Manchester")
.OrderBy((String c1, String c2) => c1.CompareTo(c2));
result = cityArrow.Invoke(cities);
foreach (var s in result)
{
Console.WriteLine(s);
}
}
private void RunArrow(List <Person> input)
{
arrow.Invoke(input);
}