Sunday, January 13, 2008

Behind the scences of LINQ

I always knew that LINQ was founded on the idea of monads but even trying hard I couldn't understand how LINQ and monads are related to each other.

But fortunately there is Wes Deyer and he describes in The Marvels of Monads what I always wanted to know. It's a pity that LINQ was always described and documented as query language rather than as a monad extensions. When I look to the msdn-documentation there is no hint that I could implement query operators on other types than IEnumerable and IQueryable.

But that's exactly what Wes is doing. He sees a more general concept and he shows a way to implement the query operators on any type. In fact this is for me a huge step and leads us to a new level of abstraction where LINQ (as a list-monad) seems to be a specific case of a monad.

My preferred way to use LINQ was the method syntax as I thought this is the more general case. But now, after knowing that the query syntax is something like a monad extension I start to like it.


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