From: "David A. Black" <dblack@...>
Date: 2005-12-03T01:06:56+09:00
Subject: Re: ruby one-liner needed

Hi --

On Fri, 2 Dec 2005, David A. Black wrote:

> Hi --
>
> On Fri, 2 Dec 2005, Kev Jackson wrote:
>
>> Here's one taht I know is possible (I'm sure I've seen it somewhere before)
>> 
>> I have 2 arrays and I'd like to change them into a Hash
>> stuff = ["1", "2", "3"]
>> Item.column_names.each { |column_name| new_item[column_name] = stuff[?] }
>> 
>> The problem is how to index within the block to move along the stuff array, 
>> and how to deal with the fact that most of the time the stuff array is 
>> shorter than the column_names array
>> 
>> I'm sure using collect, map of something else ruby-ish that this is more 
>> than possible, but I can't find a solution right now
>
>  a = [1,2,3]
>  b = [4,5,6,7,8]
>  Hash[*a.zip(b[0,a.size]).flatten
>  => {1=>4, 2=>5, 3=>6}

Actually just use the shorter one first and zip won't fill it out with
nils:

   Hash[*a.zip(b).flatten]


David

-- 
David A. Black
dblack@wobblini.net

"Ruby for Rails", forthcoming from Manning Publications, April 2006!