Ruby Benchmark: Determining the last part of a URI

last_uri_path_benchmark.rb

# gem install benchmark-ips

require "benchmark/ips"

uri = "http://twitter.com/user/statuses/1234567891011121314"

Benchmark.ips do |x|
  x.report("file.basename") { File.basename(uri) }

  x.report("split('/').last") { uri.split("/").last }

  x.report("split('/')[-1]") { uri.split("/")[-1] }

  x.compare!
end

results

Warming up --------------------------------------
       file.basename    68.360k i/100ms
     split('/').last    37.097k i/100ms
      split('/')[-1]    44.238k i/100ms
Calculating -------------------------------------
       file.basename    863.262k (±12.9%) i/s -      4.238M in   5.006200s
     split('/').last    603.615k (± 9.0%) i/s -      3.005M in   5.027355s
      split('/')[-1]    572.872k (± 9.7%) i/s -      2.875M in   5.070618s

Comparison:
       file.basename:   863262.4 i/s
     split('/').last:   603615.0 i/s - 1.43x  slower
      split('/')[-1]:   572872.0 i/s - 1.51x  slower