From: William James <w_a_x_man@...>
Date: 2008-03-06T01:54:55+09:00
Subject: Re: collect with index?

On Mar 5, 5:55 am, Tim Conner <plump4...@googlemail.com> wrote:
> simple question:  how can I do a collect with index?

You mean "map with index".

>        This should be
> like each_with_index but should return a new array containing the values
> returned by the block.
> i.e
> Say i want to return:
> ["cat number 1","dog number 2","pig number 3"
>
> how would i do this?  I am thinking that there must be something along
> the lines of:
> %w{"cat","dog","pig"}

That should be
%w(cat dog pig)

>        .collect_with_index

That should be
.map_with_index

>                           {|animal,index| animal+" number
> "+index}
>
> but I can't find a 'collect_with_index' in the documentation.  How would
> I do this?

>> irb --prompt xmp
a = %w(cat dog pig)
    ==>["cat", "dog", "pig"]
a.zip( (1..a.size).to_a ).map{|x,y| "#{x} #{y}" }
    ==>["cat 1", "dog 2", "pig 3"]