From: lasitha <lasitha.ranatunga@...>
Date: 2009-03-12T15:14:44+09:00
Subject: Re: change (and update) values of hash

On Thu, Mar 12, 2009 at 11:37 AM, lasitha <lasitha.ranatunga@gmail.com> wrote:
> On Thu, Mar 12, 2009 at 11:10 AM, Jason Lillywhite
> <jason.lillywhite@gmail.com> wrote:
>> how would I do stuff to each value of a hash and return a modified hash?
>> h = {"a"=> 3, "b"=> 5}
>> multiply each value by 2 and return
>> h = {"a"=> 6, "b"=> 10}
>
> One way (among several):
> $: irb
> 01> h = { 'a' => 3, 'b' => 5 }
> --> {"a"=>3, "b"=>5}
> 02> h.inject(h) {|h, (k, v)| h[k] = v * 2; h }
> --> {"a"=>6, "b"=>10}

I'm being silly (its fun being silly with inject :).
This is much easier:
h.each {|k, v| h[k] = v * 2 }

lasitha.