From: Doc O'Leary <droleary.usenet@3q2010.subsume.com>
Date: 2010-07-12T02:35:07+09:00
Subject: Re: Basic Question: How do you check to see if gets is a number?

In article <c2a8f01abcd51484ec6a1704fda75ebb@ruby-forum.com>,
 Adam Bourg <adam.bourg89@gmail.com> wrote:

> if ( age.to_f.to_s == true )

What do you expect this to evaluate to?  Instead of "true", did you mean 
to use "age" (i.e., compare the original string with a reconverted 
number string)?  Even that test will fail:

irb(main):003:0> "42".to_f.to_s == "42"
=> false

Barring full-blown input validation, the simple solution is to note that 
non-numbers get converted to 0.  That also happens to be an age you can 
likely reject.  Run with it.

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