gistfile1.txt

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'benchmark/ips'

Arr = Array.new(1000) { rand }.freeze

class MyClass
  def self.call(arg)
    new(arg).call
  end

  def self.foo
    @foo ||= ->(arg) { new(arg).call }
  end

  def self.bar
    @bar ||= method(:call).to_proc
  end

  attr_reader :arg

  def initialize(arg)
    @arg = arg
  end

  def call
    Float(arg)**2
  end
end

Benchmark.ips do |benchmark|
  benchmark.config(time: 10, warmup: 4)
  benchmark.report('lambda')           { Arr.each(&MyClass.foo) }
  benchmark.report('method to lambda') { Arr.each(&MyClass.bar) }
  benchmark.compare!
end

# Warming up --------------------------------------
#               lambda   300.000  i/100ms
#     method to lambda   290.000  i/100ms
# Calculating -------------------------------------
#               lambda      3.125k (± 2.5%) i/s -     31.500k in  10.086087s
#     method to lambda      2.886k (± 5.2%) i/s -     29.000k in  10.087187s

# Comparison:
#               lambda:     3125.1 i/s
#     method to lambda:     2885.6 i/s - 1.08x  slower