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Performance versus legibility

Subject: Performance versus legibility
From: "Richard Birkby" <rbirkby@xxxxxxxxxxx>
Date: Fri, 24 Nov 2000 14:16:32 -0000
not(string(.))	string-length(.)=0
not(x)		count(x)=0
not(x=y)	x!=y


I always use the expressions in the second column for maintainability, but I guess the items in the first column are faster. Is my assumption correct? Are there any other performance bottlenecks in common usage?


Richard
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