From: Colin Bartlett <colinb2r@...>
Date: 2008-05-08T17:43:09+09:00
Subject: Re: to check for numericality

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On 5/8/08, Farrel Lifson <farrel.lifson@gmail.com> wrote:
>
> @val = someValue if ( Integer( someValue) rescue Float( someValue )
> rescue false)
>
> 2008/5/8 Sijo Kg <sijo@maxxion.com>:
>
> > Hi
> >   I have
> >   @val=SomeValue           #for example 00,02,aa
> >   How can I check @val contains only numeriacal(including zero)
> >  values..I have to avoid aa above (for example )
> >
> >  Sijo
> >  --
> >  Posted via http://www.ruby-forum.com/.
> >
> >
>
>
Well that's two (or three) very useful things I didn't know.
(I have the first edition of Programming Ruby.)

I didn't know you could use "rescue" without "begin" and "end",
and I didn't know you could use "Integer" and "Float"
to test whether the *whole* of a string would convert to a number.

In this situation is there any advantage to testing for "Integer" first,
instead of just using
newval = someValue if ( Float( someValue ) rescue false )

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