Functional Programming in C#

Chapter 3. Designing function signatures and types

This chapter covers

• Well-designed function signatures
• Fine-grained control over the inputs to a function
• Using Option to represent the possible absence of data

The principles we’ve covered so far define functional programming in general, regardless of whether you’re programming in a statically typed language like C# or a dynamically typed language like JavaScript. In this chapter, you’ll learn some functional techniques that are specific to statically typed languages: because both the functions and their arguments are typed, this opens up a whole set of interesting considerations.

Functions are the building blocks of a functional program, so getting the function signature right is paramount. ...