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On 2012/5/21 3:09 PM, Albert York wrote:
I have a work field that is 2000 bytes (to allow for the longest
possible string value). The length of the data being moved to it varies
and can be quite short. I have to clear the work field before I move the
data.
Which is better:
workfield = *blanks
len = %len(%trimr(Newdata));
%substr(workfield:1:len) = *blanks;
workfield = *blanks is better. The %trimr will require that every byte
from the end backwards to the first non-blank has to be checked. You
might as well just set them to blanks as check whether they are blank.
If you already knew the length and didn't need to do the %LEN(%TRIM),
then it might be faster to do the %subst if the length to be cleared was
almost always shorter than the full length. How much shorter? I don't
know, it would depend on how long it took to evaluate the start and
length operands of the %SUBST.
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