From: Raul Parolari <raulparolari@...>
Date: 2009-12-02T01:56:39+09:00
Subject: Re: Splat array with 1 value in Ruby 1.9 vs Ruby 1.8

Robert Klemme wrote:
> 2009/12/1 Raul Parolari <raulparolari@gmail.com>:
>>>
>>>
>>
>>
>> �a = *[ 3 ] � # => a = [ 3 ] � �with Ruby 1.9.1
>>
>> I think that this is a bug in Ruby 1.9.
> 
> Regardless whether it is or is not a bug (I would not be so sure of
> that), there is a way to fix it and handle it uniformly across Ruby
> versions:
> 
> 17:31:18 test$ allruby -e 'a = [123];b = *[456];c, = [789]; p a,b,c'
> CYGWIN_NT-5.1 padrklemme1 1.5.25(0.156/4/2) 2008-06-12 19:34 i686 Cygwin
> ========================================
> ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-cygwin]
> [123]
> 456
> 789
> ========================================
> ruby 1.9.1p129 (2009-05-12 revision 23412) [i386-cygwin]
> [123]
> [456]
> 789
> ========================================
> jruby 1.4.0 (ruby 1.8.7 patchlevel 174) (2009-11-02 69fbfa3) (Java
> HotSpot(TM) Client VM 1.6.0_17) [x86-java]
> [123]
> 456
> 789
> 
> Look at variable "c".
> 
> Kind regards
> 
> robert

Indeed, this solves with grace the problem in the automation  (without 
the easy but disturbing question on "how many elements the array has"):

a,b, = [ 3, 4 ]    # => a = 3; b = 4
a,    = [ 3 ]         # => a  = 3

On the other matter ( a = *[ 3 ] ), I still think that it is a bug in 
1.9 (else I don't understand fully what a splat operator is, and I'd 
like to know more).

But thanks a lot, Robert

Raul Parolari



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