gistfile1.rb

require 'benchmark'

class Sqr
  def initialize(xs)
    @xs = xs
  end

  def run
    puts "INLINE"
    puts Benchmark.measure { @xs.map { |x| x * x } }
    puts "INSTANCE"
    puts Benchmark.measure { @xs.map { |x| sqr(x) } }
    puts "CLASS"
    puts Benchmark.measure { @xs.map { |x| self.class.sqr(x) } }
  end

  def sqr(x)
    x * x
  end

  def self.sqr(x)
    x * x
  end
end

Sqr.new(0..100000000).run