From: "Berger, Daniel" <Daniel.Berger@...>
Date: 2005-10-27T02:23:07+09:00
Subject: Re: Nuby Array questions - each iterates nested arrays?

> -----Original Message-----
> From: Ed Howland [mailto:ed.howland@gmail.com] 
> Sent: Wednesday, October 26, 2005 11:17 AM
> To: ruby-talk ML
> Subject: Nuby Array questions - each iterates nested arrays?
> 
> 
> a=[[1, 2, 3], [4, 5, 6]]
> => [[1, 2, 3], [4, 5, 6]]
> a.length
> => 2
> a.each {|x| puts x}
> 1
> 2
> 3
> 4
> 5
> 6
> => [[1, 2, 3], [4, 5, 6]]
> a.each_index {|x| puts x}
> 0
> 1
> 
> Why does each traverse into the inner arrays as well (tried 
> it with 3 and 4 deep?) Array#length seems to be correct to me 
> and Array#each_index This seems to happen to collect!, and 
> I'd gather other methods as well.

Actually, it doesn't.  It just looks that way because of the way 'puts'
works with arrays.  Try 'ruby -e "puts [1,2,3]"' to see what I mean.
See the docs on IO.puts for more details.

To see what's really happening replace 'puts' with 'p' (inspect) in your
example.

Regards,

Dan