Section on motivations

[samcunliffe]

Possibly it should go in the top-level readme, if not then episode 1.

we're missing motivations. It's difficult because I think most people learned functional programming as a technical curiosity or a way of thinking about computing mathematically. Then after a while you notice that functional programs don't suffer from certain issues that plague imperative programs.

Why learn functional programming

• Refactoring
• Testability
• Provable correctness (although perhaps we don’t want to get into that?)
• Separation of responsibility (side-effectful code in one place)
• Readability… functional style often results in short functions

[samcunliffe]

• https://medium.com/twodigits/why-you-should-learn-functional-programming-fp-4a1aaea6ac99
• https://www.researchgate.net/publication/2452204_Why_Functional_Programming_Matters