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Smalltalk Message Forms

• Unary (no parameters)

      myAngle sin
  

  (receiver = myAngle, message = sin)

• Binary (one parameter, an object)

      12 + 17
  

  (receiver=12, message=+, param=17)

• Keyword (use keywords to organize params)

      myArray at: 1 put: 5
  

  (receiver=myArray, message=at:put:, params=1, 5)

• Multiple messages to the same object can be strung together, separated by semicolons