From: Ryan Leavengood <leavengood@...>
Date: 2005-11-23T08:11:46+09:00
Subject: Re: How convert an integer to a bit array

On 11/22/05, Ryan Leavengood <leavengood@gmail.com> wrote:
>
> This way is about 4 times faster than James' version:

For those curious:

----------------------------------------------------------------------
|                     QuickBench Session Started                     |
|                         100000 Iterations                          |
----------------------------------------------------------------------
                               user     system      total        real
1. 244.to_ba               1.171000   0.000000   1.171000 (  1.172000)
2. ("%b" % 244).split(...  4.735000   0.000000   4.735000 (  4.750000)
3. s.unpack("B*")[0].s...  4.156000   0.000000   4.156000 (  4.156000)
4. 244.to_s(2).split("...  4.422000   0.000000   4.422000 (  4.437000)
----------------------------------------------------------------------
|                     Fastest was <1. 244.to_ba>                     |
----------------------------------------------------------------------

QuickBench is a little script I wrote, which I may or may not release
into the wild.

The code will follow my name (note how I use the DATA section for the
things to benchmark):

Ryan "Mr. Benchmark" Leavengood

class Integer
  def to_ba(size=8)
    a=[]
    (size-1).downto(0) do |i|
      a<<self[i]
    end
    a
  end
end

require 'quickbench'
s=" "
s[0]=244
QuickBench.go(100000, 22) {}
__END__
244.to_ba
("%b" % 244).split("").map { |n| n.to_i }
s.unpack("B*")[0].split("").map{|bit|bit.to_i}
244.to_s(2).split("").map{ |bit| bit.to_i}