• Everything is an expression
  • Errors are values
  • Principle of least surprise
    • defaults represent most common cases
    • existing conventions and idioms are adopted
  • Robustness Principle: be conservative in what you send, liberal in what you accept
  • Clarity over brevity.
  • There‚Äôs one idiomatic way to do it
  • Regularity and Orthogonality. Define a small number of concepts and allow them to be combined without restrictions.