OpenEuphoria

Re: Fast appending and sorting of alot of short strings

• Posted by "Kat" <gertie at visionsix.com> Oct 09, 2004
• 532 views

On 9 Oct 2004, at 20:19, Pete Lomax wrote:

> 
> 
> On Sat, 09 Oct 2004 05:47:34 -0700, Tommy Carlier
> <guest at RapidEuphoria.com> wrote:
> 
> >Here's a piece of code from Win4Eu 
> 
> I applied my theory to it and compared your:
> >}}}
<eucode>
> >global function addToCollection(sequence collection, object element)
> >	-- Add an element to a collection
> >	integer count, growSize
> >	count = collection[length(collection)] + 1
> >	growSize = count - length(collection)
> >	if growSize > 0 then
> >		if growSize > GROWSIZE then
> >			collection &= repeat(0, growSize + GROWSIZE)
> >		else collection &= BUFFER
> >		end if
> >	end if
> >	collection[count] = element
> >	collection[length(collection)] = count
> >	return collection
> >end function
> ></eucode>
{{{

> with:
> }}}
<eucode>
> sequence collection
> 
> procedure addTocollection(object element)
>  -- Add an element to a collection
>  integer count, growSize
>  count = collection[length(collection)] + 1
>  growSize = count - length(collection)
>  if growSize > 0 then
>   if growSize > GROWSIZE then
>    collection &= repeat(0, growSize + GROWSIZE)
>   else collection &= BUFFER
>   end if
>  end if
>  collection[count] = element
>  collection[length(collection)] = count
> end procedure
> </eucode>
{{{

> 
> They are identical apart from one is a function acting on and
> returning a parameter, whereas the other is a procedure acting
> directly on a file-level variable.
> 
> It may surprise you to find that it is 66 times faster.

Perfect example of why global variables are sometimes a necessity for 
speed, even if some people claim they are bad programming practice. Ditto 
for "goto". Thanks, Pete.

Kat