From: Brian Candler <b.candler@...>
Date: 2010-10-22T00:27:05+09:00
Subject: Re: generating random argument lists

Robert Klemme wrote in post #956028:
>> arrays = (1..rand(10)).map { (1..rand(5).map { rand(4)) } }
>
> It seems there is a bracket misalignment. :-)

Sorry, I corrected it in irb but forgot to paste it back into the 
message I was composing.

arrays = (1..rand(10)).map { (1..rand(5)).map { rand(4) } }

>> 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.

I did that originally, but (0..0).map { ... } gives a one-element array, 
and I wanted to have empty arrays too. You can omit the far end with 
(0...0), but then (0...rand(5)) gives between 0 and 3, which is even 
more confusing IMO.

> Another version with less brackets especially around ranges where I
> find them ugly:
>
> arrays = rand(10).times.map { rand(5).times.map { rand 4 } }

I'm an old fogey and avoid avoid 1.8.7-isms :-)

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