Ruby performance/benchmark measure methods

gistfile1.rb

# Ruby build-in
require 'benchmark'
puts Benchmark.measure { "a"*1_000_000 } # and Benchmark.bm, Benchmark.bmbm

# handcrafted
def performance
  t1 = Time.now.to_f
  yield
  t2 = Time.now.to_f
  return t2 - t1
end

performance {
  "a"*1_000_000
}