From: Robert Klemme <shortcutter@...>
Date: 2008-03-02T21:14:57+09:00
Subject: Re: simple question re Hash and arrays

On 02.03.2008 12:58, Esmail wrote:
> Esmail wrote:
>> Hello all,
>>
>> How come Hash[1,2,3,4] works, but
>>
>> a=[1,2,3,4]
>>
>> Hash[a] doesn't?
> 
> but Hash[*a] does?
> 
> a is an array, what is *a ??

It's also an Array.  "*" is the "spash operator" that will expand an 
Array to the argument list.

irb(main):001:0> def f(*a) p a end
=> nil
irb(main):002:0> f(1,2,3)
[1, 2, 3]
=> nil
irb(main):003:0> a=[1,2,3]
=> [1, 2, 3]
irb(main):004:0> f a
[[1, 2, 3]]
=> nil
irb(main):005:0> f a,33
[[1, 2, 3], 33]
=> nil
irb(main):006:0> f *a
[1, 2, 3]
=> nil
irb(main):007:0>

Cheers

	robert