From: Markus Jais <mjais@...>
Date: 2002-06-12T20:41:50+09:00
Subject: Re: array reference ?

Hugo de Paix de Coeur 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 ..

hello
I am not sure what you want.
with the hash modify you use the assignment operator
and with the array modify you use += 
if you want to add another alement to array a
you can write

def modify(a)
    a << [ 2 ]
end

this append the elemnt to the array. if you want to modify
a special element, write
a[index] = value

maybe I misunderstood you and this is a stupid answer.

markus