F# 4.0 Design Patterns

Chapter 3.  Basic Functions

In this chapter, I'll cover the core element of the program code built with the functional paradigm, that is, function. The notion of a function is ubiquitous indeed. In the world around us, it may mean plenty of things, from purpose of something to dependency and to work in a certain manner. But here, I will consider it through the prism of computer programming, where a function generally means a method of computing results based on inputs. This examination is going to include the following:

• The notion of a function, the function definition and type signature, pure functions, referential transparency, and side effects
• Function parameters and arguments: a special type unit, the parameter number and type, the return value ...