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Confident Code

  • Timid code
    • Prone to digressions
    • Second-guessing itself
  • Confident code
    • Intention

    • No provisos or digressions

    • Narrative

      • Gather input
      • Perform work
      • Deliver results
      • Handle failure
    • True duck typing is a confident style

    • If in doubt, coerce

    • to_a isn't in 1.9, use Array()

      require 'delegate' # Ruby std lib

      class WithPath < SimpleDelegator def path case 1 case 2 ... end end

    • Reject unexpected values outright

      • Assert your contract (no DbC framework needed)

      NOTE raise Exception, message, caller # sets context to caller

    • Guard clause to short-circuit, avoids special cases later

      • Or... the Special Case pattern
      • NullObject pattern # Maybe()
      • Hash#fetch to give back a symbol
      • jQuery selectors are confident
    • Instead of returning nil, consider returning a NullObject or other Special Case object

    • Happy path first

    • rescue idiom