From: Robert Klemme <shortcutter@...>
Date: 2010-10-21T18:55:10+09:00
Subject: Re: generating random argument lists

On Thu, Oct 21, 2010 at 10:39 AM, Brian Candler <b.candler@pobox.com> wrote:
> Robert Klemme wrote in post #956010:
>> On Thu, Oct 21, 2010 at 8:11 AM, Y. NOBUOKA <nobuoka@r-definition.com>
>> wrote:
>>> rand(10).times do
>>> arr = Array.new
>>> rand(10).times { arr << rand(4) }
>>> arrays << arr
>>> end
>>>
>>> p arrays
>>
>> Or:
>>
>> arrays = Array.new rand 10 do
>>   Array.new(rand 5) { rand 4 }
>> end
>>
>
> Or:
>
> arrays = (1..rand(10)).map { (1..rand(5).map { rand(4)) } }

It seems there is a bracket misalignment. :-)

> That also gives between 0 and 9 arrays, each with between 0 and 4
> elements, each element being between 0 and 3.

Note that rand(x) can return 0 so it would be more natural to start
ranges at 0 IMHO.

Another version with less brackets especially around ranges where I
find them ugly:

arrays = rand(10).times.map { rand(5).times.map { rand 4 } }

Cheers

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/