about ruby range?
The step method described in http://ruby-doc.org/core/classes/Range.html should do the job but seriously harms may harm the readability.
Just consider:
(0..20).step(5){|n| print ' first ', n }.each{|n| print ' second ',n }You may think that step(5) kind of produces a new Range, like why_'s question initially intended. But the each is called on the (0..20) and has to be replaced by another step(5) if you want to "reuse" the 0-5-10-15-20 range.
Maybe you will be fine with something like (0..3).map{|i| i*5}?
But "persisting" the step method's results with .to_a should also work fine.