The idea here is to test out sending functions as values over a channel.

The idea here is to test out having a function returning another function to be executed next.

The purpose of this exercise is to test how to compose a function based on what input you give to the function composer.

Testing out chaining functions on a struct by returning a pointer to the structure from each method.

Same as test nr 19 for testing chaining functions on a struct, but this one returns an interface from the methods instead of a pointer to the structs, so we only make the methods available and not the types of the structs while chaining.

Higher order functions.