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QuestionBecoming functional: adding Option of T to List when IsSome only Pin
Bernhard Hiller13-Dec-20 23:55
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Eventually I decided to start with the functional concept and installed the LanguageExt library (see GitHub - louthy/language-ext: C# functional language extensions - a base class library for functional programming[^] ). In our code base, there is a class which is full of bool TryGet(some parameters, out T result) functions - I want to change them to Option<T> TryGet(some parameters).

But then, things start to look ugly at a different level. E.g.
List<PointF> result = new List<PointF>();
foreach (IIntersectionInfo intersection in intersections)
    Option<PointF> angle = m_Geometry.TryGetAnglesForPosition(intersectionPoint, _name);
    if (angle.IsNone)
        Logger.LogWarning(Name, $"Cannot determine angle for position '{intersectionPoint}' corresponding to pixel '{pixel}'.");
There are two kinds of ugliness:
- I have to use the IfNone(PointF.Empty) clause even when angle is guaranteed to be Some there.
- I do not know how to get rid of the foreach in this situation.

How can the code become clean?
Oh sanctissimi Wilhelmus, Theodorus, et Fredericus!

AnswerRe: Becoming functional: adding Option of T to List when IsSome only Pin
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