Functional Programming in C#, Second Edition

4 Designing function signatures and types

This chapter covers

• Designing good function signatures
• Fine-grained control over the inputs to a function
• Using Unit as a more flexible alternative to void

The principles we’ve covered so far define FP 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. Having functions and their arguments typed 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. And because a function signature is defined in terms ...