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const performanceTest = (func, iterations) => {
  const before = performance.now()
  
  for(let i = 0; i < iterations; i++) {
    func()
  }
  
  const after = performance.now()
  const elapsed = after - before
  
  return `${elapsed.toFixed(6)}ms`
}

const iterations = 10000000 // 10 million

console.info(`${iterations.toLocaleString()} iterations.`)

const timings = {
  '() => {}': (
    performanceTest(
      () => {},
      iterations,
    )
  ),
  'Function.prototype': (
    performanceTest(
      Function.prototype,
      iterations,
    )
  ),
}

console.info(
    JSON.stringify(
        timings,
        null,
        4,
    )
);