From: Tim Hunter <TimHunter@...>
Date: 2007-06-21T07:34:53+09:00
Subject: Re: Code Critique: check if int or float

ole __ wrote:
> Hello again folks,
>
> I'm really starting to like this language. I'm working towards building
> a simple expression evaluator. I couldn't seem to find any methods for
> testing whether a string contains an integer or float. In PHP (where I'm
> from) you've got your is_numeric(). Is there such a method in Ruby?
>   

The Integer() method raises an exception if its argument isn't an integer:

Integer("1") is okay.
Integer("1.0") raises ArgumentError.

Similarly Float() raises an exception if its argument isn't a Float:

Float("1.0") is okay.
Float("1") is okay.
Float("x") raises ArgumentError.

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