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The "big 3" higher-order functions in functional programming are Filter, Map and Reduce. When looking at the new C# 3.0 LINQ query operators, we find that all three have equivalents: * Filter = Where * Map = Select * Reduce = Aggregate Whenever you find yourself needing one of these three higher-order functions, just translate them into the correct query operator. "Select" doesn't have the same dictionary meaning as "Map", but the signature is exactly the same.