From: Aaron Smith <beingthexemplary@...>
Date: 2007-03-09T07:17:48+09:00
Subject: Re: generate UUID

Robert Klemme wrote:
> On 08.03.2007 22:44, Aaron Smith wrote:
>>     hexCode = ""
>>     1.upto(l) do |i|
>>       hexCode << validChars[rand(length-1)]
>>     end
>>     hexCode
>> end
>> 
>> r =
>> "#{rand_hex(8)}-#{rand_hex(4)}-#{rand_hex(4)}-#{rand_hex(4)}-#{rand_hex(12)}"
>> puts r
> 
> Make validChars and length constants declared outside the method.  And
> also, use rand(length) otherwise you never get a "9".  You could also
> use ?A..?F and ?0..?9 - no idea whether that makes a performance diff.
> 
> But I guess this one is even faster:
> 
> def rand_hex_2(l)
>    rand(1 << (l*4)).to_a(16)
> end
> 
> Kind regards
> 
>   robert


def rand_hex_2(l)
   rand (1 << (l*4) ).to_a(16)
end
puts rand_hex_2(9)

ArgumentError: wrong number of arguments (1 for 0)


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