delete suffix

bench.rb

require 'benchmark/ips'

TIME = 10_00
STR = "ruby"

puts RUBY_VERSION

Benchmark.ips do |bm|
  bm.report "gsub" do
    TIME.times do
      STR.gsub('by', '')
    end
  end

  bm.report "sub" do
    TIME.times do
      STR.sub('by', '')
    end
  end

  bm.report "delete_suffix" do
    TIME.times do
      STR.delete_suffix('by')
    end
  end

  bm.compare!
end

gistfile1.txt

2.7.1
Warming up --------------------------------------
                gsub   146.000  i/100ms
                 sub   299.000  i/100ms
       delete_suffix   676.000  i/100ms
Calculating -------------------------------------
                gsub      1.423k (± 7.2%) i/s -      7.154k in   5.061408s
                 sub      2.956k (± 4.8%) i/s -     14.950k in   5.070308s
       delete_suffix      6.955k (± 4.1%) i/s -     35.152k in   5.063523s

Comparison:
       delete_suffix:     6955.1 i/s
                 sub:     2956.0 i/s - 2.35x  (± 0.00) slower
                gsub:     1422.7 i/s - 4.89x  (± 0.00) slower