nevermind, I should have tested my code
class String
def is_numeric?
!self.to_f.zero? || self == '0' || self == '0.0'
end
end
>> 'test'.is_numeric?
=> false
>> '123cm'.is_numeric?
=> true
>> '10_000'.is_numeric?
=> true
Of course that's not a perfect solution
- Matt
On Fri, Jan 22, 2010 at 12:24 PM, Matt Aimonetti <[email protected]>wrote:
> well... you can just do:
>
> class String
> def is_numeric?
> !self.to_f.nil?
> end
> end
>
>
> - Matt
>
>
>
> On Fri, Jan 22, 2010 at 12:18 PM, Greg Willits <[email protected]> wrote:
>
>> On Jan 22, 2010, at 11:35 AM, Glenn Little wrote:
>>
>> I'm looking for a simple way to check if a string really represents
>>> a number in ruby/rails. I figured there would be a String.is_numeric?
>>> but haven't found anything.
>>>
>>
>> I have independent interpretations of is_numeric and represents_number.
>>
>> "123.6 cm" and "$19.95" are not numeric, but they do represent a number.
>>
>> "-123.45" is numeric and represents a number.
>>
>> "|123.45|" is numeric and represents a number.
>>
>> "1.55e08" is numeric and represents a number.
>>
>> "1.55e-08" is numeric and represents a number.
>>
>> For Rails, you might be interested in my custom AR validations...
>> http://www.gregwillits.ws/articles/custom-validation-in-rails
>>
>> Though these are designed to specifically isolate what type of number I
>> want (integer, decimal, etc) in a form input field, so might not be what
>> you're after as a general purpose method.
>>
>> Personally, I prefer the regex route. It'll take a little work to think
>> about exactly what I'm willing to accept, but at least I know more
>> explicitly how to predict and test the behavior.
>>
>> --
>> def gw
>> lives_at 'www.gregwillits.ws'
>> end
>>
>>
>> --
>> SD Ruby mailing list
>> [email protected]
>> http://groups.google.com/group/sdruby
>>
>
>
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