# Reverse indexing (was RE: Ruby and WMI) **URL:** \ **Category:** Ruby\ **Created:** [November 23, 2005, 3:34am UTC](https://www.ruby-forum.com/t/reverse-indexing-was-re-ruby-and-wmi/52986 "2005-11-23T03:34:35Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![botp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/258eb7/32.png) [@botp](https://www.ruby-forum.com/u/botp)\ **Post date:** [November 23, 2005, 3:34am UTC](https://www.ruby-forum.com/t/reverse-indexing-was-re-ruby-and-wmi/52986/1 "2005-11-23T03:34:35Z")
#C:\family\ruby\>irb --simple-prompt #\>\> x=[0,1,2,3,4,5] #=\> [0, 1, 2, 3, 4, 5] … #otherwise, these will return empty arrays # #\>\> x[-1…2] #=\> [] # #\>\> x[-1…-5] #=\> [] # #\>\> x[-1…-4] #=\> [] # on the second thought, what if ruby allows the above such that, considering index equivalence for x: 0 1 2 3 4 5 -6 -5 -4 -3 -2 -1 > > x[-1…2] > > =\> [5,4,3,2] > > x[-1…-5] > > =\> [5,4,3,2,1] > > x[-1…-6].each{|x| print x} > > 543210 =\>[5,4,3,2,1,0] and since arrays are ordered, we may have notation for reverse traversal of array … dunno, just nuby here. kind regards -botp ---
**Author:** ![botp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/258eb7/32.png) [@botp](https://www.ruby-forum.com/u/botp)\ **Post date:** [November 23, 2005, 9:36am UTC](https://www.ruby-forum.com/t/reverse-indexing-was-re-ruby-and-wmi/52986/2 "2005-11-23T09:36:41Z")
On 11/23/05, Peña, Botp [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > and since arrays are ordered, we may have notation for reverse traversal of array … Did you know you can use reverse\_each? x = (0…5).to\_a x.reverse\_each do |i| print i end #=\> 54321 Regards, Sean