From: sto.mar@...
Date: 2013-07-30T19:55:50+09:00
Subject: Re: How to check an input IS an integer ?

Am 30.07.2013 12:03, schrieb Captain Ishido:
> Hi everyone !
> I have a little problem since a few days. I would like to check that my
> user (I am writing a small program) had type an integer while I asked him.

There are several possibilities, the one I like best in this case
is using a Regex (Note that user input is always a String):

2.0.0p247 :005 > answer = '123'
 => "123"
2.0.0p247 :006 > /\A[0-9]+\z/ === answer
 => true
2.0.0p247 :007 > answer = '123abc'
 => "123abc"
2.0.0p247 :008 > /\A[0-9]+\z/ === answer
 => false

Other possibilities can easily be found by searching the archives,
e.g. using Integer(), (which involves rescuing exceptions, which I
do not like for this use case too much).

Regards,
Marcus


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