Andrei has some nice code to work with Enumerations and while showing it to the team today, I tried to chain calls like this:
[Test]public void Can_Chain_Select_Collect_and_More() {
bool satisfying = Enumerating.On(_array)
.Select(IsEven)
.Collect<string>(delegate(string input) { return input + "-" + input; })
.AreAllSatisfying(Satisfies);
Assert.IsTrue(satisfying);}
private bool Satisfies(string obj) {
return obj == "2-2" || obj == "4-4" || obj == "6-6";
}
But this did not work :-( (To much C# 3.0 exposure I guess) because methods like Select and Collect return ICollection<T>.
So I changed it.
You can grab it here: Enumerating.Zip. Of course all praise to Andrei, all blame to me.
How did I do it?
Well I Just changed
ICollection<R> Collect<R>(Converter<T, R> convert);
ICollection<R> Map<R>(Converter<T, R> convert);
ICollection<T> Select(Predicate<T> satisfies);
ICollection<T> FindAll(Predicate<T> satisfies);
ICollection<T> Filter(Predicate<T> satisfies);
ICollection<T> Reject(Predicate<T> satisfies);
ICollection<R> SelectThenCollect<R>(Predicate<T> satisfies, Converter<T, R> converter);
ICollection<T> Sort(Comparison<T> comparison);
to
IEnumerating<R> Collect<R>(Converter<T, R> convert);
IEnumerating<R> Map<R>(Converter<T, R> convert);
IEnumerating<T> Select(Predicate<T> satisfies);
IEnumerating<T> FindAll(Predicate<T> satisfies);
IEnumerating<T> Filter(Predicate<T> satisfies);
IEnumerating<T> Reject(Predicate<T> satisfies);
IEnumerating<R> SelectThenCollect<R>(Predicate<T> satisfies, Converter<T, R> converter);
IEnumerating<T> Sort(Comparison<T> comparison);
So its possible to chain commands that return more than one thing.
And I added
ICollection<T> ToCollection();to make the tests work.
