From: Kyle Schmitt <kyleaschmitt@...>
Date: 2008-09-24T02:09:19+09:00
Subject: Re: Breaking apart arrays for arguments?

On Tue, Sep 23, 2008 at 11:41 AM, Thomas B. <tpreal@gmail.com> wrote:
> Hello. It's the splat operator:
>
> meth(*args_array)


Thanks.  Evidence there isn't enough coffee in my office :)

Although it's odd. I would have expected using the splat operator to
provide better performance than flatten, doesn't seem to be the case.
I guess I need to read up on the underpinnings of ruby's splat.

require 'benchmark'
$size=1024
$runs=1024

Benchmark.bm do
	|bm|
	bm.report("unshift pure") do
		unshifter=Array.new($size){0}
		1.upto($runs) do
			|index|
			unshifter.unshift(*Array.new($size){index})
		end
	end
	
	bm.report("unshift, flatten at end") do
		unshifter=Array.new($size){0}
		1.upto($runs) do
			|index|
			unshifter.unshift(Array.new($size){index})
		end
		unshifter.flatten!
	end
end

      user     system      total        real
unshift pure  4.060000   0.660000   4.720000 (  5.908041)
unshift, flatten at end  1.660000   0.550000   2.210000 (  2.431595)