Re: Memory tests
Re: Memory tests
- Subject: Re: Memory tests
- From: Richard Morton <email@hidden>
- Date: Fri, 19 Mar 2004 12:40:24 +1100
On 19 Mar 2004, at 11:16 AM, Nelson Byrne wrote:
1) What's the difference between these two lists?
[a,b,c] and (a,b,c)
Umm, one of them is not a list. ;-)
2) What is the "best type"? ... or was it "best class"?
There have been discussions over the years on the relative merits of
the vector list:
["textItem", 42, someVariable]
Versus the other, standard, type whose name I can't remember:
{"textItem", 42, someVariable}
I think the general consensus is that the differences are irrelevant
for most purposes. Another way of putting it is that if you're needing
to optimise something, there are other things that will benefit you
more.
For example, when adding to a list, use this:
set the end of myList to myNewItem
Rather than this:
set myList to myList & myNewItem
Items can be added to the beginning of a list as well. The preferred
method is considerably more memory efficient.
Operations involving lists containing many items - say in the hundreds
- can get very slow. The "Serge Method" (which I don't have a simple
example of at hand) can be used here and has been discussed a number of
times on this list. I know Nigel Garvey has posted some good stuff on
it. An archive search may locate it, or someone may have an example
they can post. The break even point OMM is about 20 items but it still
doesn't always make it worthwhile. For me anyway. If you expect to be
regularly dealing with lists of 50 or more items *and* the list
operation is a bottleneck, it's definitely worth using.
Cheers,
Float N Point
-- If a point floats in the forest... Never mind...
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| | >Memory tests (From: Nelson Byrne <email@hidden>) |