is evaluation order defined, and evaluation of conditionals

Peter Haworth pete at lcsql.com
Mon Jun 25 19:40:27 EDT 2012


If the dead cat does not exist, there will be no check for bad smell.
Pete
On Jun 25, 2012 4:17 PM, "Dr. Hawkins" <dochawk at gmail.com> wrote:

> Is the order in which expressions will be evaluated defined int LiveCode
>
> For example, if I have fields such as live_cats live_dogs and such,
> some but not others of which have corresponding fields dead_cat,
> dead_mouse, etc, can if have a construct that comes to
>
> switch
>  case exists(dead_cat) and  ("bad_smell" is among the words of dead_cat)
>
> If it is defined that the leftmost expression is evaluated first, and
> the right-hand only if needed to resolve the "and," I would expect
> this to work.
>
> If it doesn't, though, things get more difficult:  using the exists()
> within the switch throws me down that path, and only down it can I
> check bad_smell.
>
> --
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