Functional C# & LINQ

Treat behavior as data with delegates and lambdas, then query anything with LINQ.

1. 4.1

   Delegates & lambdas

   • Func / Action
   • Lambda expressions
   • Closures
   • Delegates and lambdas— Treat behavior as data — store functions in variables and pass them to other methods.12 min
   • Closures and higher-order functions— Understand how lambdas capture variables, and build function factories and caches.11 min
2. 4.2

   Events

   • event keyword
   • Publishers & subscribers
   • Events— Let objects notify any number of listeners when something happens, without knowing who they are.11 min
3. 4.3

   LINQ

   • Where / Select / OrderBy
   • GroupBy / Join
   • Query syntax
   • Deferred execution
   • LINQ basics: filter, project, sort— Query collections declaratively with Where, Select, OrderBy and LINQ's aggregate methods.13 min
   • LINQ: grouping, joining and flattening— Summarize data with GroupBy, combine sequences with Join and SelectMany, and meet query syntax.13 min
   • Deferred execution and iterators— Understand when LINQ queries actually run, and write your own lazy sequences with yield return.12 min