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I Just can't seem to wrap my head around them. As I understand it's dynamically adding logic to a class. Are classes within the framework prepared for this? Why should I just extend the class and add the functionality to it in the extension. I would be globally accessible and afaik much easier to maintain. I've Read there are 4 functor types: Comparer Closure Predicate Transformer We should probably Handle each one of them. p.s. is there something like it in vb? So I can state I think that lambda expressions are functors. This clears up things for me a bit :) (hehe) Lambda expressions are functors? Anonymous functions are functors? But I asked this question because I ran into another type of fucntors namely these ones: delegate void FunctorDelegate(int value); class Addition { FunctorDelegate _delegate; public Addition AddDelegate(FunctorDelegate deleg) { _delegate += deleg; return this; } public int AddAllElements(IList< int> list) { int runningTotal = 0; foreach( int value in list) { runningTotal += value; _delegate(value); } return runningTotal; } } And then calling it with this: int runningTotal = new Addition() .AddDelegate(new FunctorDelegate( delegate(int value) { if ((value % 2) == 1) { runningOddTotal += value; } })) .AddDelegate(new FunctorDelegate( delegate(int value) { if ((value % 2) == 0) { runningEvenTotal += value; } })) .AddAllElements(list); So no fancy lambda style things. Now I have this example but it isn't at all

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