Delegates, Lambda Expressions & Closures in C#

If you are familiar with programming, you might have heard of a specific paradigm called functional programming. Most modern languages, such as Java and C#, have integrated some functional elements over time. Other, like Scala and Haskell, were built around that very idea of functional programming.

This online course will look at some of the functional features available in C# 3.0, including the concept of anonymous functions, delegates and lambda expressions. But before doing that, we need to understand what functional programming actually means.

If you are interested, keep reading, and we will explore the following topics:

Anonymous functions
Delegates
Anonymous delegates
Multicast delegates
Lambda expressions
Lambda statements
Expression-body members
Expression trees
Local functions
Closures

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Iterators in C#: yield, IEnumerable & IEnumerator

Iterating over lists in C# is often done using for loops. This tutorial shows how the foreach construct can be coupled with the yield statement to create more elegant and safe code.

Introduction
Part 1. Implementation
Part 2. The yield Statement
Part 3. Limitations
Conclusion

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Extension methods in C#

Following the heritage of C++, C# comes with a number of powerful features which can either be used to massively improve your code …or to make it completely unreadable. In this post we’ll discuss a technique to add new methods to already existing classes. Yes, even classes you don’t have access to such as Vector3, Rigidbody and even string. Let’s introduce extension methods with a practical example.

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