Add a benchmark for basic performance of memoised methods

lib/memoist.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+require 'memoist/version'
 require 'memoist/core_ext/singleton_class'
 
 module Memoist

memoist.gemspec

@@ -32,6 +32,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_development_dependency "benchmark-ips"
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "minitest", "~> 5.5.1"

script/benchmark.rb

@@ -0,0 +1,48 @@
+$:.unshift File.expand_path(File.dirname(__FILE__)+"/../lib")
+require 'benchmark/ips'
+
+require 'memoist'
+
+class Benchy
+  extend Memoist
+
+  def arity_0
+    "Hello World"
+  end
+  memoize :arity_0
+
+  def arity_1(name)
+    "Hello #{name}"
+  end
+  memoize :arity_1
+end
+
+OBJECT = Benchy.new
+
+puts "Benchmarking: #{Memoist::VERSION}"
+
+Benchmark.ips do |x|
+  x.report("arity 0 - memoized") do |times|
+    times.times do
+      OBJECT.arity_0
+    end
+  end
+
+  # x.report("arity 0 - unmemoized") do |times|
+  #   times.times do
+  #     OBJECT._unmemoized_arity_0
+  #   end
+  # end
+
+  x.report("arity 1 - memoized") do |times|
+    times.times do
+      OBJECT.arity_1(:World)
+    end
+  end
+
+  # x.report("arity 1 - unmemoized") do |times|
+  #   times.times do
+  #     OBJECT._unmemoized_arity_1(:World)
+  #   end
+  # end
+end