arrays transformations benchmark

arrays_transformations_benchmark.rb

# source: https://github.com/rails/rails/pull/33806#issuecomment-431908935

require "benchmark/inputs"

INPUTS = [
  [1, 2, 3],
  [1, nil, 2, nil, 3, nil],
  [nil, nil, nil],
]

Benchmark.inputs(INPUTS) do |job|
  job.dup_inputs = true
  job.report("lazy"){|array| array.flatten.compact.lazy.uniq.to_a }
  job.report("normal"){|array| array.flatten.uniq.compact }
  job.report("bang!"){|array| array.flatten!; array.uniq!; array.compact! }
  job.report("tap(&:bang!)"){|array| array.tap(&:flatten!).tap(&:uniq!).tap(&:compact!) }
  job.report("tap{|a| a.bang! * 3 }"){|array| array.tap{|a| a.flatten!; a.uniq!; a.compact! } }
  job.report("tap{|a| a.bang! } * 3"){|array| array.tap{|a| a.flatten! }.tap{|a| a.uniq! }.tap{|a| a.compact! } }
  job.compare!
end