> if this works exactly like "indexOf" in java, then it seems like it > should be in the core ... but as "position", or "pos", based on your > description. Why the core? I'm mentioned this before: symmetry, > since nth is there. Others would argue, "leave it out" since > there's a way to do it from java. Personally, if you don't know > java, you ain't gonna be thinking "indexOf".
It doesn't work like indexOf. indexOf returns one index, and searches for a literal value. The CL equivalent is position. I wouldn't use position/pos — those names imply (as they do in CL) a single position, searching from the start or end. Stuart's index-filter returns a list: user=> (index-filter even? [1 2 3 4 5 6]) (1 3 5) The appropriate name as far as Common Lisp naming conventions go would be "positions-if" — http://leitl.org/docs/comp/HyperSpec/Body/f_pos_p.htm#position … that is, position finds the index of an item, position-if finds the index of an item matching the predicate, so positions-if should find all such matching indices. I can't say I see any use for this function in my own coding style, but it certainly seems like a reasonable and general function to have. It's probably worth creating the whole bundle: position position-if positions positions-if and maybe even the find-* friends. -R --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
