Benchmarking String#split and String#rpartition

string_split_vs_rpartition.rb

# frozen_string_literal: true

require 'benchmark'

input = "This::Is::One::Heavily::Nested::Module"

n = 1_000_000

Benchmark.bm do |benchmark|
  benchmark.report("String#split") do
    n.times do
      input.split("::").last
    end
  end

  benchmark.report("String#rpartition") do
    n.times do
      input.rpartition("::").last
    end
  end
end

=begin
$ ruby benchmark.rb
       user     system      total        real
String#split  0.840000   0.000000   0.840000 (  0.845646)
String#rpartition  0.500000   0.000000   0.500000 (  0.510527)
=end