Ruby multi-line string performance

strings.rb

require "benchmark"
require "active_support/core_ext/string/strip"

n = 10_000

Benchmark.bm do |bm|
  bm.report("string") do
    n.times do
      "hello\nthere\nbear"
    end
  end
  
  bm.report("array") do
    n.times do
      ["hello", "there", "bear"].join("\n")
    end
  end 
  
  bm.report("heredoc") do
    n.times do
      <<-HERE
        hello
        there
        bear
      HERE
    end
  end

  # !!!!!!
  bm.report("tilde heredoc") do
    n.times do
      <<~HERE
        hello
        there
        bear
      HERE
    end
  end

  bm.report("strip heredoc") do
    n.times do
      <<-HERE.strip_heredoc
        hello
        there
        bear
      HERE
    end
  end

  bm.report("strip heredoc nodash") do
    n.times do
      <<HERE.strip_heredoc
        hello
        there
        bear
HERE

    end
  end
end


# sorted results (ruby 2.6.0)
#                           user     system      total        real
# tilde heredoc         0.000661   0.000124   0.000785 (  0.000796)
# string                0.001885   0.000134   0.002019 (  0.002053)
# heredoc               0.001981   0.000056   0.002037 (  0.002100)
# array                 0.009141   0.000597   0.009738 (  0.009806)
# strip heredoc nodash  0.111129   0.005337   0.116466 (  0.121615)
# strip heredoc         0.114132   0.006298   0.120430 (  0.130637)

# sorted results (ruby 2.4.3)
#                           user     system      total        real
# heredoc               0.000000   0.000000   0.000000 (  0.002136)
# tilde heredoc         0.000000   0.000000   0.000000 (  0.002205)
# string                0.010000   0.000000   0.010000 (  0.002565)
# array                 0.020000   0.000000   0.020000 (  0.019595)
# strip heredoc nodash  0.120000   0.000000   0.120000 (  0.120830)
# strip heredoc         0.110000   0.000000   0.110000 (  0.124549)