On Wed, May 24, 2017 at 8:25 PM, Mark Waddingham via use-livecode
<use-livecode@lists.runrev.com> wrote:
>
Thanks Mark for the explanation.
> choose tValue
> when 1
> when 2
> when 3
> -- executes if tValue is 1, 2 or 3
> -- never falls through
>
> when 4
> -- never falls through
>
> default
> end choose
>
> This caters for both cases (1) and (2) and is unambiguous.
>
Whilst I certainly like the above and think it an improvement, if I
were to 'step back' and redesign Switch I think I'd make it clearer
that 'fall through' is just an OR - it took me ages to realise and
I've have very very long: case ((....) OR (....) OR (....) ....) which
were extremely long and very hard to read until I rewrote them as
case
case
case
case
---do something
break
What I can't currently solve is the many case ((.....) AND (,,,,) AND
(....) AND (...)... )
So, again if I were reinventing Switch:
choose tVale
when 1
or 2
or 3
--do something
-- no further fall through
when > 6
and < 60
and even
--do something else
--no further fall through
when 4
--do another thing
default
--some other thing
end choose
Just makes it clear that fall through is being used to combine the
statements, but in my design it isn't just restricted to OR.
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