Advanced C#: Functional Programming Patterns

Introduction

• Functional programming patterns
• What you should know
• Working with GitHub

1. Overview

• Overview of the functional programming concepts?

2. Favor Pure Functions

• Write pure functions for better code
• Example of an impure function
• Refactor impure function to pure
• Reduce code side effects
• Don't mutate input arguments
• Use an immutable argument

3. Immutable Types

• Principles of immutable types
• Read-only properties
• Instance method in immutable type
• Use helper methods to create new instance
• Use factory method to create instance

4. Side Effects and I/O

• Work with files
• Calculate the total in pure function
• Randomness in functional programming

5. Choose Expressions

• Why expressions are better for functional programs
• Rewrite statements as expressions

6. Functional Functions

• Use Func for first-class functions
• Higher order functions

7. Function Composition and Pipelining

• Composition patterns
• Compose functions
• Pipelining with extension methods
• Pipelining with generic methods
• Pipelining with IEnumerable

8. Work with Lists

• Understand map and other concepts
• Map with LINQ select
• Filter with LINQ where
• Flatten with SelectMany
• Join with SelectMany
• Fold with Sum and Aggregate

Conclusion

• Next steps