From: Ian Whitlock <iw1junk@...>
Date: 2007-07-28T04:24:58+09:00
Subject: Re: How to pass arguments by reference in a function

Lloyd Linklater wrote:
> My question is, which is more efficient?

It may depends on the definition of efficient.
Try it with a = "13" and b = "17".

In terms of execution time it is a horse race
that doesn't matter much.  Try

require "benchmark"
include Benchmark

n = 100001

bm(10) do |x|
  a = 13
  b = 17
  x.report("XOR") {n.times {a ^= b;b ^= a;a ^= b} }
  puts a , b
  x.report("ruby") {n.times {b,a = a,b} }
  puts a , b
end

Ian
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