Unsupplied Value

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The Unsupplied class implements the value used to initialize unsupplied keyword parameters to functions.

There is one distinguished instance of the Unsupplied class in the reserved system variable unsupplied .

You can test to see whether a caller has supplied an optional keyword argument by comparing it with unsupplied .

Constructor

Unsupplied 

fn testFunction arg1 optionalArg2: =
(
  if optionalArg2 == unsupplied then
    format "Optional Argument Was Not Supplied!\n"
  else
    format "Arguments Were Supplied, Their Sum Was %!\n" (arg1+optionalArg2)
)
 
testFunction 10.0
--> Optional Argument Was Not Supplied!
 
testFunction 10.0 optionalArg2:32
--> Arguments Were Supplied, Their Sum Was 42.0!

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