Metaprogramming

• Writing programs that produce programs
• Java examples
  • for can be translated to while
  • foreach can be translated to for
  • enum can be translated to a class
  • Lambda can be translated to class
• Common Lisp macros
  • Extend language yourself
  • Language features become libraries
  • CLOS
• Ruby
  • Generating classes at runtime
  • instance_eval
• Domain Specific Languages
  • Regexes
  • SQL
  • Common Lisp’s LOOP and FORMAT
  • React