include_vs_when.rb

require 'benchmark'

class Dummy
  
  @VALID_OPTIONS = :first, :last, :all
  
  class << self
    def when_find(*args)
      case args.first
      when *@VALID_OPTIONS
        send(args.first)
      else
        find_with_ids(*args)
      end
    end
  
    def include_find(*args)
      if @VALID_OPTIONS.include? args.first
        send(args.first)
      else
        find_with_ids(*args)
      end
    end
  
    def first;end
    def last;end
    def all;end
    def find_with_ids(*args);end
  end
end

Benchmark.bmbm do |bm|
  bm.report("first with when:")     { Dummy.when_find :first }
  bm.report("first with include?:") { Dummy.include_find :first }
  bm.report("last with when:")     { Dummy.when_find :last }
  bm.report("last with include?:") { Dummy.include_find :last }
  bm.report("all with when:")     { Dummy.when_find :all }
  bm.report("all with include?:") { Dummy.include_find :all }
  bm.report("ids with when:")     { Dummy.when_find [1,2,3] }
  bm.report("ids with include?:") { Dummy.include_find [1,2,3] }
end