Paramcount caution

[Jim Hurley]

Jim Hurley wrote:

 on mouseUp

 >    put "3,4" into a

    print1 a
    print2 a
 end mouseUp

 on print1 x,y
    get the paramcount
    if it is  1 then
      put item 2 of x into y
      put item 1 of  x into x
    end if
    put x &  return  after field 1
    put y & return after field 1
 end print1

 on print2 x,y
    print1 x,y

 end print2

 Jan Schenkel wrote:

 When you call print2 it has only 1 parameter, which it places
into x. Since it can't find a 'y' parameter, it
assumes you want to create it and thus passes an empty
value as the second parameter to print1.

Jan and Dar,

Thanks for clearing up this distinction between "empty" and "missing". I'm sure the assumption made in Transcript (i.e. assume that an empty parameter was intended) is the right one in most cases. It is one of the many assumptions that must be made in a language as forgiving as Transcript. I will settle any day for these occasional points of confusion to the alternative of rigid typing rules for variables.

In the future I will take the coward's way out and just duplicate in toto those handlers that call synonyms which make use of the paramcount. Don't tell anybody.
--
Jim Hurley
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