Improved benchmark to see which is faster, either when *array or array.include?

include_vs_when.rb

require 'benchmark'

class Dummy

  class << self
    def when_find(*args)
      case args.first
      when :first, :last, :all
        send(args.first)
      else
        find_with_ids(*args)
      end
    end

    def include_find(*args)
      if [:first, :last, :all].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|
  N = 999999
  bm.report("first with when:") { N.times {Dummy.when_find :first } }
  bm.report("first with include?:") { N.times {Dummy.include_find :first } }
  bm.report("last with when:") { N.times {Dummy.when_find :last } }
  bm.report("last with include?:") { N.times {Dummy.include_find :last } }
  bm.report("all with when:") { N.times {Dummy.when_find :all } }
  bm.report("all with include?:") { N.times {Dummy.include_find :all } }
  bm.report("ids with when:") { N.times {Dummy.when_find [1,2,3] } }
  bm.report("ids with include?:") { N.times {Dummy.include_find [1,2,3] } }
end