[REBOL] Rolling your own ideal looper: does Repeat still have a bug? Re:(4)
From: lmecir:geocities at: 28-Aug-2000 22:10
Hi,
being asked I try to explain my changes.
1. Thanks, Gabriele, I forgot to use one more Throw, but the
original is needed too. I used Throw attribute to make sure, that
any Return or Exit contained in code like:
f: does [ideal-looper elem indx [1 2 3] [exit]]
does what it should, ie. causes the exit of F.
2. Any-type! specification is needed, because a series in Rebol
can contain even eg. Unset! values, in which case the function
without the spec. wouldn't work.
3. For uses While anyway, so it is a shortcut. (see Source For,
but look out! It still contains the series bug I reported to
feedback.)
The corrected version:
ideal-looper: func [
[throw]
'element [word!]
'index [word!]
series [series!]
code [block!]
/local f i
] [
f: func reduce [[throw] element [any-type!] index] code
i: 1
while [i <= length? series] [f series/:i i i: i + 1]
]
Regards
Ladislav
