Benchmark for Compact vs Nil check

gistfile1.txt

require "benchmark/ips"

Benchmark.ips do |x|
  x.config(:time => 5, :warmup => 2)

  # To reduce overhead, the number of iterations is passed in
  # and the block must run the code the specific number of times.
  # Used for when the workload is very small and any overhead
  # introduces incorrectable errors.
  x.report("add-if-not-nil") do |times|
    i = 0

    add_item = "bar/bas/sdfsdf/fdfdsaf/fdsfdsaf/dsfdsf"

    while i < times
      array = [ :key ]
      array << add_item if add_item

      i += 1
    end
  end

  x.report("skip-if-nil") do |times|
    i = 0

    add_item = nil

    while i < times
      array = [ :key ]
      array << add_item if add_item

      i += 1
    end
  end

  x.report("build-and-compact") do |times|
    i = 0
    add_item = "bar/bas/sdfsdf/fdfdsaf/fdsfdsaf/dsfdsf"

    while i < times
      array = [ :key, add_item ].compact

      i += 1
    end
  end

  x.report("build-and-compact-nil") do |times|
    i = 0
    add_item = nil

    while i < times
      array = [ :key, add_item ].compact

      i += 1
    end
  end

  x.compare!
end


Warming up --------------------------------------
      add-if-not-nil   213.305k i/100ms
         skip-if-nil   230.887k i/100ms
   build-and-compact   206.259k i/100ms
build-and-compact-nil
                       213.858k i/100ms
Calculating -------------------------------------
      add-if-not-nil     25.357M (± 2.4%) i/s -    126.703M in   4.999725s
         skip-if-nil     34.338M (± 2.3%) i/s -    171.780M in   5.005449s
   build-and-compact     16.808M (± 2.2%) i/s -     84.154M in   5.009277s
build-and-compact-nil
                         16.473M (± 2.1%) i/s -     82.335M in   5.000452s

Comparison:
         skip-if-nil: 34337930.8 i/s
      add-if-not-nil: 25357210.2 i/s - 1.35x  slower
   build-and-compact: 16808426.0 i/s - 2.04x  slower
build-and-compact-nil: 16473080.8 i/s - 2.08x  slower