From: Phillip Curry <philfo@...>
Date: 2010-01-19T19:26:06+09:00
Subject: Re: string to int

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Yeah that's exactly what I was looking for.  Thanks for the help, I'm prett=
y
new to ruby and still exploring all this stuff.

2010/1/19 Jes=FAs Gabriel y Gal=E1n <jgabrielygalan@gmail.com>

> On Tue, Jan 19, 2010 at 11:13 AM, Phillip Curry <philfo@gmail.com> wrote:
> > Is there a nice way to convert a string to an integer if it is in fact =
an
> > integer, and to return nil or even an error if it's not?  The method to=
_i
> > returns 0 if the string is not an integer, which isn't hugely helpful, =
as
> I
> > want to be able to distinguish between the integer 0 and non-integer
> > strings.
> > thanks
> >
>
> Try this:
>
> irb(main):002:0> Integer("12")
> =3D> 12
> irb(main):003:0> Integer("fdfdf")
> ArgumentError: invalid value for Integer: "fdfdf"
>        from (irb):3:in `Integer'
>        from (irb):3
>        from :0
> irb(main):005:0> Integer("12ijk")
> ArgumentError: invalid value for Integer: "12ijk"
>        from (irb):5:in `Integer'
>        from (irb):5
>        from :0
> irb(main):006:0> "12ijk".to_i
> =3D> 12
>
> But check the last example: to_i would have returned 12 ignoring the
> rest of the string, while Integer will raise an exception. Don't know
> if this fits your criteria.
>
> Jesus.
>
>

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