From: botp <botpena@...>
Date: 2008-02-07T12:01:00+09:00
Subject: Re: Array Practice

On Feb 7, 2008 7:20 AM, Adam Akhtar <adamtemporary@gmail.com> wrote:
> As some of you may know from previous threads im trying to practice
> specific areas of ruby. One simple exercise i set myself was taking a
> elements in an array such as
>
> [1,2,3,1,2,2,4,3,2,1]
>
> and then grouping them together and putting them in subarrays within an
> array like this
>
> [ [1,1,1], [2,2,2,2] , [3,3] ,[4] ]
>

irb(main):002:0> a=[1,2,3,1,2,2,4,3,2,1]
=> [1, 2, 3, 1, 2, 2, 4, 3, 2, 1]
irb(main):003:0> a.group_by{|x|x}
=> {1=>[1, 1, 1], 2=>[2, 2, 2, 2], 3=>[3, 3], 4=>[4]}
irb(main):004:0> a.group_by{|x|x}.values
=> [[1, 1, 1], [2, 2, 2, 2], [3, 3], [4]]

ruby1.9 though. i'm threading on 1.9 since it is fast, i mean really
fast, even on windows :)
kind regards -botp