From: Robert Klemme <shortcutter@...>
Date: 2009-12-11T02:23:35+09:00
Subject: Re: human-readable listing of array elements

2009/12/10 Aldric Giacomoni <aldric@trevoke.net>:
> Marnen Laibow-Koser wrote:
>>
>> Yes.  case won't handle <= conditions AFAIK.
>
> That is a very good point, though it does handle ranges, so "case 0..1"
> would fit this particular scenario.
> Your elsif statement is probably better suited here though.

That point is not exactly true: while it doesn't out of the box, it
can easily be made to:

irb(main):001:0> ONE_OR_LESS = lambda {|n| n <= 1}
=> #<Proc:0x1014ed90@(irb):1 (lambda)>
irb(main):002:0> class <<ONE_OR_LESS; alias === []; end
=> nil
irb(main):003:0> 5.times {|i| case i; when ONE_OR_LESS then puts
"yow!" else puts "nah" end}
yow!
yow!
nah
nah
nah
=> 5
irb(main):004:0>

Apart from that, the length of an Array can as a minimum become only 0
so the same test can be done as

case array.size
when 0,1 # <= 1
...
when
...
end

Kind regards

robert

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