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miguel-vila/Jessica Kerr "Functional Principles for Object Oriented Development" .md

Last active January 19, 2016 15:34
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Jessica Kerr "Functional Principles for Object Oriented Development" .md

Jessica Kerr "Functional Principles for Object Oriented Development"

Principles

  • Data In, Data Out: (Most) Functions should only depend on its parameters and should do nothing but produce output.
    • Testable: No need to setup extern dependencies or tear them down after testing
    • Easier to understand: Only local context dependent
    • A good "data in, data out" function should:
      • don't access global state
      • don't modify the input
      • don't bother the rest of the world
  • Inmutability
    • Default mutability = Accidental complexity
    • The less state you can change the less you must think about
    • Threadsafe by definition
    • A mutable class can be changed ANYWHERE
    • Google's Guava -> inmutability in java
  • Declarative style
    • Familiar != Readable
    • Type alias help: type FirstName = String
  • Laziness
    • Guava iterable -> lazily evaluated
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