From: "Peña, Botp" <botp@...>
Date: 2008-04-15T16:51:08+09:00
Subject: Re: noob 'why doesn't this work' question

From: Peña, Botp [mailto:botp@delmonte-phil.com] 
# irb(main):004:0> sizeList.group_by.with_index{|e,i| 
# countarray.include? i}
# => {false=>[0, 1, 2, 5], true=>[3, 4, 6]}

6th way :)

:0> sizeList.values_at(*(0..sizeList.size-1).to_a-countarray)
=> [0, 1, 2, 5]

this one plays w the indices, then uses values_at to get back to the contents.

kind regards -botp