From: ara.t.howard@...
Date: 2006-12-01T23:28:29+09:00
Subject: Re: time = ["min", "sec"].collect {|i| {i=> Time.now.send(i).to_i}}

On Fri, 1 Dec 2006, x1 wrote:

> What's the best way to make the first item below yield a hash instead
> of an array in one line? I'm struggling :(
>
> #doesnt work
> time = ["min", "sec"].collect {|i| {i=> Time.now.send(i).to_i}}
> puts time.type # Array
>
> #works
> time = ["min", "sec"].collect {|i| {i=> Time.now.send(i).to_i}}.first
> puts time.type # Hash
> puts time['min']


harp:~ > cat a.rb
now = Time.now
h = %w( min sec ).inject({}){|h,k| h.update k => now.send(k).to_i}

p h


harp:~ > ruby a.rb
{"sec"=>44, "min"=>26}


in particular you don't want to call Time.now inside the loop: you'll otherwise
sometimes get

   {"sec"=>0, "min"=>42}

when you should have gotten

   {"sec"=>59, "min"=>41}

regards.

-a
-- 
if you want others to be happy, practice compassion.
if you want to be happy, practice compassion.  -- the dalai lama