Lazy Evaluation (and in contrast, Eager Evaluation)

Eric White's Blog : Query Composition using Functional Programming Techniques in C# 3.0

Thu, 19 Jun 2008 10:08:53 GMT

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re: Lazy Evaluation (and in contrast, Eager Evaluation)

Marv Schwartz — Fri, 04 Jul 2008 17:25:22 GMT

So is this what is really happening? Query composition sets up a chain of IEnumerable<T> objects--the queries. Starting with the final query in the chain, each query requests the next item from the immediately preceding query.

The first query in the chain returns its first item which is passed back transformed, and possibly filtered out as it moves through the chain.

When an item is filtered out, that query reverses direction and gets the next item.

To get the next item a query calls the MoveNext() and Current() methods of the immediately preceding query. Reset() is propagated from the final query to the first query in the chain.

This description would really benefit from a picture.

Closures

Eric White's Blog — Fri, 12 Sep 2008 05:46:46 GMT

Closures are one of the key components in C# 3.0 that makes functional programming easy, and results

Using LINQ to Query Excel Tables

Eric White's Blog — Fri, 14 Nov 2008 18:00:17 GMT

[Blog Map] Excel has a very cool feature where you can declare that a range of cells is a table. It is