FP in Real Life

Learning Goals

Apply FP principles on a real life example

Connect - Remember the Future of the past 🤪

Complete the sentences below:

... holds one of two values Left or Right.
... is a monadic container which represents a computation that may either throw an exception or successfully completes.
... don't refer to any global state -> same inputs will always return the same output.
... is a type safe alternative to null values.
... is the using to rule them all.
... is any type that defines how map works.

Correction

Either holds one of two values Left or Right.
Try is a monadic container which represents a computation that may either throw an exception or successfully completes.
Pure Functions don't refer to any global state -> same inputs will always return the same output.
Option is a type safe alternative to null values.
using static LanguageExt.Prelude is the using to rule them all
A functor is any type that defines how map works.

Concepts

You already know what you need to use those concepts in your code base. So today let's focus only on practicing.

Concrete Practice - FP in Real Life

Open RealLifeExample and refactor the code in a more readable / functional way. We propose to follow those steps:

Understand what is implemented
Define the pipeline you would like to design
- What are the ins / outs?
Then refactor to tend to this pipeline

Step-by-step solution available here

Conclusion - Compare

Let's compare our refactored code with the original one.

How do you rate the readability of those 2?
Can you spot any remaining code smells?
How good is the test coverage?