From: Martin DeMello <martindemello@...>
Date: 2009-03-08T02:12:29+09:00
Subject: Re: how to un-ragged a 2D array?

On Sat, Mar 7, 2009 at 9:48 PM, Phlip <phlip2005@gmail.com> wrote:
> Rubies:
>
> Here's a ragged array:
>
>  [ [ 1    ],
>   [ 2, 3 ],
>   [ 4    ],
>   [ 5, 6 ],
>   [ 7    ],
>   [ 8    ] ]
>
> How, with the tightest, or most modern, or coolest statements, can we turn
> it into this?
>
>  [ [ 1, 1 ],
>   [ 2, 3 ],
>   [ 4, 4 ],
>   [ 5, 6 ],
>   [ 7, 7 ],
>   [ 8, 8 ] ]

a.each {|i| i[1] ||= i[0]}

martin