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• Posted by Derek Parnell <ddparnell at bigpond.com> Jun 27, 2001
• 573 views

Hi Karl,

> The wordiness I was trying to address was not the 'append', but
> the redundant 'seq'. My way is a failure; Is there another way?

How about borrowing some symbols used in regular expressions...
  seq $= "aaaa"  -- Append
  seq ^= "aaaa"  --Prepend

By the way, Daryl, "&=" is not the same as append().

append() always adds ONE new element to the left hand side sequence. That
being the entire right hand side object. Thus after an append() the length
of LHS is always increased by exactly one.

&= and & always adds AS MANY ELEMENTS as in the right side to the left hand
side sequence. Thus after a concatenation '&' operation, the length of LHS
is always increased by length(RHS). 

   sequence a, b

   a = "abc"
   b = "def"
   a = append(a,b)
   ? a  -- Should be { 'a', 'b', 'c', {'d', 'e', 'f'}}
   -- Length of a is now 4!

   a = "abc"
   b = "def"
   a &= b
   ? a  -- Should be { 'a', 'b', 'c', 'd', 'e', 'f'}
   -- Length of a is now 6!

---------
cheers,
Derek Parnell
Senior Design Engineer
Global Technology Australasia Ltd
dparnell at glotec.com.au

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