Professional programming

• Discuss global variables.

• What exactly should a function ideally do? One thing!

• Classes, scripted namespaces and ordinary namespaces.

• Public interface (Black box principle)

• Multiple versus single undo/redo stack

• Direct versus traditional functions - pros and cons

  • You cannot trace into one-line direct functions
  • No thread switches in direct functions after line 0
  • Direct functions have disadvantages when it comes to tracing.

• Passing parameters to functions

  • List of values (typically mandatory parameters, right argument)
  • Optional parameters (often left argument)
  • Lists of key-value pairs
  • Namespace with variables and possibly references

• The dfns workspace.

• Names!

  There are only two real challanges in writing software: memory management and finding the right names.