Comments on: C#: Refactoring to functional collection parameters

By: Functional Collection Parameters: A different way of thinking about collections at Mark Needham

Thu, 18 Jun 2009 14:13:57 +0000

[...] written previously about the ways I’ve been making use of functional collection parameters in my code but what I hadn’t really considered was that the way of [...]

By: Dew Drop - February 3, 2009 | Alvin Ashcraft's Morning Dew

Dew Drop - February 3, 2009 | Alvin Ashcraft's Morning Dew — Tue, 03 Feb 2009 14:54:20 +0000

[...] C#: Refactoring to Functional Collection Parameters (Mark Needham) [...]

By: Reflective Perspective - Chris Alcock » The Morning Brew #278

Reflective Perspective - Chris Alcock » The Morning Brew #278 — Tue, 03 Feb 2009 08:16:54 +0000

[...] C#: Refactoring to functional collection parameters – Mark Needham shows some of the nice collection refactorings that are possible in C#3 [...]

By: Mark Needham

Mark Needham — Tue, 03 Feb 2009 00:46:27 +0000

Ah cool, didn’t realise that!

Thanks for the FirstOrDefault tip as well – was wondering how to do that.

By: Robin Clowers

Robin Clowers — Tue, 03 Feb 2009 00:05:41 +0000

Good post Mark, I too enjoy these kinds of refactorings (careful though, it can be addicting)!

Anyway, in your GetSpecialFoo example, you can simplify by passing your predicate (Foo => foo.HasSpecialFlag()) into the First method, eliminating the call to Where. Also, First will throw an exception if it never finds any items matching the predicate, so you should really use FirstOrDefault to match the functionality of the original method.