From: Jean-Hugues ROBERT <jean_hugues_robert@...>
Date: 2002-06-12T23:58:22+09:00
Subject: Re: array reference ?

At 20:01 12/06/2002 +0900, you wrote:
>Hi,
>consider this bunk of code:
>
>         irb(main):001:0> def modify(a)
>         irb(main):002:1>   a += [ 2 ]
>         irb(main):003:1> end
>         nil
>         irb(main):004:0> a = [ 1 ]
>         [1]
>         irb(main):005:0> modify(a)
>         [1, 2]
>         irb(main):006:0> a
>         [1]                                  <<<< a hasn't been modified
>         irb(main):007:0>
>
>Why "a" isn't modified by "modify" function?, because this work with a
>Hash class:
>
>         irb(main):013:0> def modify(h)
>         irb(main):014:1>   h[2] = 2
>         irb(main):015:1> end
>         nil
>         irb(main):016:0> h = { 1 => 1 }
>         {1=>1}
>         irb(main):017:0> modify(h)
>         2
>         irb(main):018:0> h
>         {1=>1, 2=>2}                          <<<< h has been modified
>
>How can i make it working with an array?
>thanks ..

a << [2] I guess.
a += [ 2 ] is equivalent to a = a + [ 2 ]. This changes a, not the array.

Jean-Hugues


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