Benchmark Ruby Each

@array = 1..100000000

def case0 #### 5s
  i = Time.now
  @array.each do |o|
    # puts "#{o}"
  end
  (Time.now - i)
end

def case1 #### 8s
  i = Time.now
  @array.each_with_index do |o, i|
    # puts "#{o}"
  end
  (Time.now - i)
end

def case2 ##### 15.5s
  i = Time.now
  @array.each_slice(3) do |t|
    t.each do |o|
      # puts "#{o}"
    end
  end
  (Time.now - i)
end

def case3 ##### 15.7s
  i = Time.now
  @array.each_with_index do |o, i|
    # puts "#{o}"
    m = 2
    if m == 0 || i == 1
    end
    if m == 0
    end
  end
  (Time.now - i)
end

def case4 ##### 17s
  i = Time.now
  @array.each_with_index do |o, i|
    # puts "#{o}"
    m = i % 3
    if m == 0 || i == 1
    end
    if m == 0
    end
  end
  (Time.now - i)
end

def case5 ##### 18s
  i = Time.now
  @array.each_with_index do |o, i|
    # puts "#{o}"
    if i % 3 == 0 || i == 1
    end
    if i % 3 == 0
    end
  end
  (Time.now - i)
end

case0
case1
case2
case3
case4
case5