Ruby blocks vs JS callbacks

js-callback-args.js

function benchmark(cb) {
  const start_time = 12345;

  const result = cb('some message');
  console.log("the return value of cb was: ", result);

  const end_time = 12456;
  return end_time - start_time
}

const time_taken = benchmark((message) => {
  let s = 'asdf';
  for (let i = 0; i < 100000; i++) {
    s[2] = 'z';
  }
  console.log("the message:", message)
  return "some result value";
})

console.log(time_taken);

ruby-blocks.rb

def benchmark
  start_time = Time.now

  result = yield 'some message'

  puts "the return value of the block: #{result}"

  end_time = Time.now

  end_time - start_time
end

long_string = 'apple'*10000000

running_time = benchmark do |msg|
  long_string.reverse
  puts "the message: #{msg}"
  "some result value"
end

puts "it took: #{running_time}"