Altering a function's behavior

In the previous section, we considered some ways of wrapping functions so that they maintain their original functionality, even though they've been enhanced in some way. Now, we'll turn to modify what the functions do so that the new results will differ from the original function's ones.

We'll be covering the following topics:

• Revisiting the problem of having a function work, but just once
• Negating or inverting a function's result
• Changing the arity of a function

Let's get started!

Doing things once, revisited

Back in Chapter 2, Thinking Functionally – A First Example, we went through an example of developing an FP-style solution for a simple problem...