to_f is too "smart":
>> "5.not_a_number".to_f
=> 5.0
-glenn
Matt Aimonetti 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]
<mailto:[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.
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