From: "David A. Black" <dblack@...>
Date: 2005-10-14T04:13:57+09:00
Subject: Re: array1 + array2 newb question

Hi --

On Thu, 13 Oct 2005, Kroeger, Simon (ext) wrote:

>
>
>> -----Original Message-----
>> From: Devin Mullins [mailto:twifkak@comcast.net]
>> Sent: Thursday, October 13, 2005 6:22 AM
>> To: ruby-talk ML
>> Subject: Re: array1 + array2 newb question
>>
>> AHH! Nevermind. I can't read.
>>
>> a1=[1,2,3]
>> a2=%w{a b c}
>> a2.map {|o2| a1.map {|o1| [o1,o2]}}
>
> leads to
> [[[1, "a"], [2, "a"], [3, "a"]], [[1, "b"], [2, "b"], [3, "b"]], [[1,
> "c"], [2, "c"], [3, "c"]]]
>
> which isn't equal to
>
> [[1, "a"], [1, "b"], [1, "c"], [2, "a"], [2, "b"], [2, "c"], [3, "a"],
> [3, "b"], [3, "c"]]

   require flattenx # available on RAA :-)
   [1,2,3].map {|m| %w{a b c}.map {|n| [m,n] } }.flatten_once

   => [[1, "a"], [1, "b"], [1, "c"], [2, "a"], [2, "b"], [2, "c"], [3,
      "a"], [3, "b"], [3, "c"]]


David

-- 
David A. Black
dblack@wobblini.net