functional programming

• functional programming is a way of writing code by means of pure functions
• benefits of functional programming:
  1. Immutability
     • All values derived from old values
  2. Testability
     • Pure functions are easy to test
• difficulties of functional programming:
  1. unintuivive
     • many people learn programming either imperatively or in an object-oriented manner
  2. impractical?
     • interfacing with “the real world” is challenging