From: Robert Klemme <shortcutter@...>
Date: 2011-03-22T22:05:07+09:00
Subject: Re: summing values in a hash?

On Tue, Mar 22, 2011 at 2:01 PM, Adam Prescott <mentionuse@gmail.com> wrote:
> On Tue, Mar 22, 2011 at 12:57 PM, Jen <jen.bottom@gmail.com> wrote:
>
>> Is there an inbuilt method to sum all values in a hash and return the
>> result?
>>
>> I.E something like puts hash[values].sum
>>
>
> You could try
>
> hash.values.inject { |a, b| a + b }
>
> Alternatively, you have the shorter form, inject(&:+) or inject(:+)
> depending on your version of Ruby. 1.8.7 and higher should support all
> three.

You should rather use a different idiom because your solution breaks
for empty Hash:

irb(main):001:0> {}.values.inject {|a,b|a+b}
=> nil
irb(main):002:0> {}.values.inject(0) {|a,b|a+b}
=> 0

Kind regards

robert


-- 
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