From: David Jacobs <developer@...>
Date: 2011-02-24T12:49:29+09:00
Subject: Re: How to inhibit the use of letters and allowing just numbers

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Hi Matt,

If you want to check that one variable is referring to a Numeric and not a String, you can do:

def foo(input)
case input
when Numeric
process input
else
puts "You should've entered a number!"
end
end

If you want to filter an Array for only numbers, you can do something like:

def foo(inputs)
inputs.select {|e| e.is_a? Numeric }
end

David
On Wednesday, 23 February 2011 at 10:38 pm, Matt Victorio wrote: 
> Hello,
> 
> I started using Ruby few weeks ago and I have a little problem:
> 
> How do I inhibit the user of using numbers instead of letters?
> 
> For exemple, I created a program that asks the user his age, but I want
> the user answer it using only numbers, not letters ('10', not 'ten').
> Which command do I use for returning the line 'use just numbers', for
> exemple?
> 
> Please, tell me anything, even if it looks 'hard' :P
> 
> Thank you
> 
> -- 
> Posted via http://www.ruby-forum.com/.
> 

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