Practice inspired by www.composingprograms.com

My experiments inspired by "Composing Programs" which is authored and maintained by John DeNero.

• char_converter, the example of applying the constraint programming paradigm for converting Characters to/from Ascii codes
• pure_oop, a pure implementation of the Object-Oriented Paradigm (encapsulation, polymorphism, inheritance) in one function
• fibonacci_iter, a simple iterator for producing Fibonacci sequence (up to a defined value)