if+include VS case+expand benchmark

require "benchmark/ips"

FIRST_CASE = ["house", "home", "building"]
SECOND_CASE = ["boat", "vessel", "ship"]
ARGUMENT = "vessel"

def if_include_test
  if FIRST_CASE.include?(ARGUMENT)
    :first
  elsif SECOND_CASE.include?(ARGUMENT)
    :second
  else
    nil
  end
end

def case_expand_test
  case ARGUMENT
  when *FIRST_CASE then :first
  when *SECOND_CASE then :second
  else
    nil
  end
end

Benchmark.ips do |x|
  x.report("if + include?") { if_include_test }
  x.report("case + expand") { case_expand_test }
  x.compare!
end

=begin
Warming up --------------------------------------
       if + include?   544.249k i/100ms
       case + expand   335.889k i/100ms
Calculating -------------------------------------
       if + include?      5.255M (± 9.5%) i/s -     26.124M in   5.022296s
       case + expand      3.389M (± 8.3%) i/s -     17.130M in   5.089028s

Comparison:
       if + include?:  5254775.2 i/s
       case + expand:  3388705.3 i/s - 1.55x  (± 0.00) slower
=end