From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-26T03:15:44+09:00
Subject: Re: Change a string to an integer, report an error if the string does not represent an integer?

7stud -- wrote:
> 7stud -- wrote:
>>   str.each_byte do |char|
>>     if start
>>       start = false
>>       if char == ?+ or char == ?-
>>         next
>>       end
>>     end
>> 
>>     if char < ?0 or char > ?9
>>       return false
>>     end
>>   end
>> 
>>   return true
>> end
>> 
>> strings = ['0013abc', '0025', '-0030', '+051', '00-1', '-abc72']
>> strings.each do |str|
>>   if valid_int?(str)
>>     puts str.to_i
>>   else
>>     puts 'invalid int'
>>   end
>> end
> 
> 
> --output:--
> invalid int
> 25
> -30
> 51
> invalid int
> invalid int

Ugh.  This is much faster:

strings = ['0013abc', '0025', '-0030', '+051', '00-1', '-abc72']

strings.each do |str|
  if str.match(/^(\-|\+)?\d+$/)
    puts str.to_i
  else
    puts "invalid int"
  end
end
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