From: Lars Haugseth <ruby-talk@...>
Date: 2012-07-13T18:41:56+09:00
Subject: Re: how to check string is numeric or not

On 07/13/2012 11:08 AM, Robert Klemme wrote:
> On Fri, Jul 13, 2012 at 10:19 AM, Lars Haugseth
> <ruby-talk@larshaugseth.com> wrote:
>
>> If o is allowed to be a Fixnum, you need to cast to string first:
>>
>>    /\A\d+\z/ === o.to_s
>
> WTF?  (That's the first time I remember me writing this here.)
>
> Let me get that straight: you want to convert something which you
> *know* is an integer to a String to check whether it is an integer?

Not quite. The question was about checking a value that could be a 
string, integer, float or presumably anything, and return true if the 
value contains digits only, false otherwise. At least that's how I 
interpret the message starting this thread.

-- 
Lars Haugseth