From: Lloyd Linklater <lloyd@2live4.com>
Date: 2007-07-28T03:42:18+09:00
Subject: Re: How to pass arguments by reference in a function

ashishwave wrote:
> For example: if i want to write my own swap function (not using
> multiple assignment syntax a,b=b,a) just for example example, how to
> implement that in ruby

That reminds me, in the old days you could do a swap without a third 
variable using XOR.  e.g.

a = 13
b = 17

a ^= b
b ^= a
a ^= b

and they are swapped.

I know that Ruby might do it as mentioned above.

My question is, which is more efficient?
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