From: Ruby Mania <lists@...>
Date: 2012-10-15T06:19:43+09:00
Subject: Re: how to join the return of array

Superb ! thnx ! I was mising on such a small concept :(

Henry Maddocks wrote in post #1079820:

> Because the default value of an uninitialised hash key is nil and nil
> doesn't respond to <<
>
>
>>> out = {}
> => {}
>>> out['foo']
> => nil
>>> out['foo'] << 'bar'
> NoMethodError: undefined method `<<' for nil:NilClass
>   from (irb):3
>   from /Users/henry/.rbenv/versions/1.9.3-p125/bin/irb:12:in `<main>'
>>>
>
>
> Henry

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