From: David Vallner <david@...>
Date: 2006-11-18T10:27:37+09:00
Subject: Re: ruby equivalent PHP function is_numeric?

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ara.t.howard@noaa.gov wrote:
> On Sat, 18 Nov 2006, Josselin wrote:
>=20
>> After reading completely my Ruby book, I cannot find a function
>> equivalent to the PHP  is_numeric? to test a String
>>
>> myString.is_numeric?   (check only digits and dot character)   =3D>=20
>> return true or false
>>
>> does it exist ? or it's more complicated than that ? (need to build a
>> regex... ?)
>>
>> thanks
>>
>> joss
>=20
>=20
>=20
>   harp:~ > cat a.rb
>   def is_numeric?(n) Float n rescue false end
>=20

def is_numeric?(n) begin Float n; return true rescue false end

Predicate methods not returning a boolean make my skin crawl even if
it's all the same difference for conditionals.

David Vallner


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