Ruby min Vs sort Vs sort!

gistfile1.txt

#! /usr/bin/env ruby

require "benchmark"

Benchmark.bmbm(7) do |x|

  iterations = 10_000
  a = 4000.times.map { |i| rand(i * 100).to_i }

  x.report("min") do
    iterations.times do |i|
      a.min
    end
  end

  x.report("sort!.first") do
    iterations.times do |i|
      a.sort!.first
    end
  end

  x.report("sort.first") do
    iterations.times do |i|
      a.sort.first
    end
  end
end