benchmarking different ways of splitting up a string

string_split_benchmark.rb

sentence = "rake routes --help this last part"

def with_split sentence
  a = sentence.split('--')
  @build_args = "--" << a[1]
  @args = a[0]
end

def with_slice sentence
  dash_ind = sentence.index("--")
  @build_args = sentence.slice(dash_ind +  1...sentence.length)
  @args = sentence.slice(0...dash_ind)
end

def with_index sentence
  dash_ind = sentence.index("--")
  @build_args = sentence[dash_ind + 1...sentence.length]
  @args = sentence[0...dash_ind]
end

def test_time(start_time, end_time)
  end_time - start_time
end

%w[with_split with_slice with_index].each do |method_name|
  start_time = Time.now
  10000.times do
    send method_name.to_sym, sentence
  end
  end_time = Time.now
  puts "#{method_name} method works in #{test_time(start_time, end_time)} seconds"
  puts "#{method_name}: build_args are: '#{@build_args}'"
  puts "#{method_name}: args are: '#{@args}'\n\n"
end