From: Christoph <chr_news@...>
Date: 2002-09-07T12:41:07+09:00
Subject: Re: Ruby aesthetics


"Gavin Sinclair" wrote
....
> Can anyone comment on the performance difference between procs and
> singleton definitions?

The (calling) performance of procs is generally worth
then their the method counter-part (independent of
their ``singleton-ness'').  Also the creation time of
a singleton method is probably smaller than the
creation time of a general proc object.

---
                             user      system           total        real
fib_lambda  25.266000   0.071000  25.337000 ( 26.859000)
fib                 6.850000   0.000000    6.850000 (  7.570000)
fib_class      54.449000   0.340000  54.789000 ( 58.965000)
---
---
# needs 1.7

fib_lambda = lambda {|n|
    if n < 2
      n
    else
      fib_lambda[n - 1] + fib_lambda[n-2]
    end
}

def fib(n)
    if n < 2
      n
    else
      fib(n - 1) + fib(n - 2)
    end
end

fib_class = Class.new do
  def self.[](n) new(n).fib end
  def initialize(n)
    @n =n
  end
  def fib
    if @n < 2
      @n
    else
      type[@n-1] + type[@n-2]
    end
  end
end


require 'benchmark'

Benchmark::bmbm { |test|
  test.report("fib_lambda") { fib_lambda[29] }
  test.report("fib") {  fib(29) }
  test.report("fib_class") { fib_class[29] }
}
---

/Christoph