Begin Constructor Arguments Property

Evaluating an object constructor is very similar to evaluating a function call. LW Python starts by pushing the constructor's arguments into the "Arguments" stack. More formally,

if the following are true:

  • expression state at time t = "begin_expr"
  • the expression at time t = Python constructor with name: class_name and arguments: args

then arguments stack at time (t + 1) = [ args, arguments stack at time t ]

LW Python pushes the arguments into the "Arguments" stack so that it can start evaluating the arguments. For example,

if the following are true:

  • expression state at time 9 = "begin_expr"
  • the expression at time 9 = Person("John", "Smith", 25)

then arguments stack at time (9 + 1) = [ [ "John", [ "Smith", [ 25, [ ] ] ] ], arguments stack at time 9 ]

Try stepping through the simulator to see the arguments get pushed into the "Arguments" stack.

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