Re: Nested IF, OR and AND in /free

You could easily write separate IN procedures for character strings or
numeric values (although they obviously couldn't both be called 'IN'). Or,
with some 'trickery', write a single procedure that can cope with both (as
well as dates, times, timestamps etc.)...

On Wed, Nov 2, 2011 at 11:04 AM, John Yeung <gallium.arsenide@xxxxxxxxx>wrote:

On Wed, Nov 2, 2011 at 11:53 AM, DeLong, Eric <EDeLong@xxxxxxxxxxxxxxx>
wrote:

While not EXACTLY an "in list" function, for the example below, there is

a hack...

If ( %scan(chk1 : '1|7|8|9') > 0 ) and chk6 <> ' '

Nice! The pipes serve both to make it clearer *and* to make it more
flexible (compared to solutions based on %check, for example). In
this form, it even *looks* a bit like "if myvar in (val1, val2,
val3)".

I appreciate the concerns some may have that this is on the "clever"
side, but I think it's just part of learning a language more fully.
Once learned, a neat and compact idiom like this can be faster to read
than a more verbose and cluttered one. (Though nicer still would be
for IBM to add direct support for an in-values construct. Even if you
like this %scan trick, it doesn't work for numeric values.)

John
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