loops: having my cake and eating it too?

[gusl]

One programming annoyance when writing loops is wanting to access each element of the list without passing the index, i.e. with code like: for (el in list) while simultaneously wanting to know the index without writing i=0 and i++.

I'm not aware of any solutions to this in current usage.

Comments

[gustavolacerda.livejournal.com]

is that just 1 for-loop?

[fare.livejournal.com]

Yes, one loop during which the index increases as the elements of the list are enumerated.

If you want to nest, you can have a (loop ...) inside a (loop ...).

[fare.livejournal.com]

Note that the Common Lisp LOOP facility is very nice in some ways, has somewhat extensible implementations, but has weird limitations and unniceties when you want advanced usage.

See Olin Shivers' LOOP (for Scheme) for the best LOOP story ever.