QTIPS - Fast Dynamic Array Building [Revelation On-Line Wiki]

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====== QTIPS - Fast Dynamic Array Building=====

^Published By^Date^Version^Knowledge Level^Keywords^
|Sprezzatura Ltd|01 JAN 1993|3.01+|EXPERT|DYNAMIC, ARRAY|

Just in case there are developers who still use angle brackets instead of
string concatenation operators to build up a dynamic array (perhaps because
of their slightly improved aesthetic appeal), be aware that although the
< -1 > syntax is easy and convenient to use, it can be up to TWENTY or
THIRTY times slower than direct string concatenation, especially when used
to construct a dynamic array in a loop.

Since the < -1 > syntax can be used to insert values into the centre of a
larger array, it always finds the position to insert at by counting
delimiters on every iteration. This results in the spectacular performance
difference witnessed when the array itself is large.


(Volume 4, Issue 8, Page 14)