OpenEuphoria

Your thoughts on two item id methods?

• Posted by Al Getz <Xaxo at aol.com> Oct 18, 2005
• 518 views

Hello there,


Im looking at something that needs to tell the difference between two
different classes of elements in a loop.  The two methods presented
here both work, but they work somewhat different.  I'd like to hear
any thoughts anyone has on these two methods, as to which one if any
seems better and why...

METHOD #1

Atoms are of one class, while sequences are of the other class.
Here, we know items of class 1 are atoms, while class 2 items are sequences.
This way we can tell the difference between class 1 items and class 2 items...

itemlist={ 1,2,3,{8,9},4,{6,7} } --atoms and sequences
for k=1 to length(itemlist) do
  item=itemlist[k]--atom or seq
  if atom(item) then
    DoClass1Stuff(item)
  else
    DoClass2Stuff(item)
  end if
end for



METHOD #2

Atoms will be in a sequence where the first element is zero, while
the other class will always have a '1' as first element with the real
data in elements 2 and above.  Thus, class 1 elements start with a zero
and class 2 elements start with a 1...

itemlist={ {0,1},{0,2},{0,3},{1,8,9},{0,4},{1,6,7} } --all sequences

for k=1 to length(itemlist) do
  item=itemlist[k]--always a sequence
  if item[1] then
    DoClass2Stuff(item)
  else
    DoClass1Stuff(item)
  end if
end for

I'm not that worried about the increase in memory space taken by
the second method.
In each itemlist there will be approx the same number of class 1 items
as there are class 2 items.

Thanks for your time and thoughts...


Take care,
Al

And, good luck with your Euphoria programming!

My bumper sticker: "I brake for LED's"