lazy_benchmark.rb

require 'benchmark/ips'

Benchmark.ips do |x|
  x.report("with lazy") do
    (1..1_000_000).lazy
                      .select(&:odd?)
                      .map(&:to_s)
                      .take(1000)
  end

  x.report("without lazy") do
    (1..1_000_000).select(&:odd?)
                      .map(&:to_s)
                      .take(1000)
  end
end