Benchmark of Case/If

case.rb

require 'benchmark/ips'

thing = 102
Benchmark.ips do |x|
  x.report('block') do
    case thing
    when -> (a) { a < 100 && a.even? } then 1
    when -> (a) { a > 100 && a.odd? } then 2
    else 3
    end
  end

  x.report('if statement') do
    if thing < 100 && thing.even?
      1
    elsif thing > 100 && thing.odd?
      2
    else
      3
    end
  end

  x.report 'without block' do
    # NOTE: does not do exactly the same as 'if statement' and 'block'
    # just for reference
    case thing
    when 0..100 then 1
    when 100..200 then 2
    else 3
    end
  end
end




Calculating -------------------------------------
               block    53.914k i/100ms
        if statement   127.066k i/100ms
       without block    93.789k i/100ms
-------------------------------------------------
               block    904.035k (± 6.4%) i/s -      4.529M
        if statement      7.098M (± 8.0%) i/s -     35.324M
       without block      2.327M (± 5.7%) i/s -     11.630M