From: Colin Bartlett <colinb2r@...>
Date: 2009-12-26T02:03:54+09:00
Subject: Re: Newbie Question

On Fri, Dec 25, 2009 at 3:51 PM, Rajinder Yadav <devguy.ca@gmail.com> wrote:
> lalawawa wrote:
>>
>> How do I turn the string "4.5" into the number 4.5 so I can do
>> arithmetic on it?
>
> irb(main):017:0> "4.5".to_f
> => 4.5

Or if you want "4.5" to convert to a Float but "4.5q" to raise an
error/exception:

Float("4.5")   #=> 4.5
Float("4.5q")  #=> ArgumentError "invalid value for Float"