Quickly benchmark js code

benchmark.js

var Benchmark = require('benchmark'),
    suite = new Benchmark.Suite;

var x = new Array(20).fill(0);

// add tests
suite.add('test 1', function() {
  // your code here
})
suite.add('test 2', function() {
  // your code here
})


// add listeners
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  var opsHigh = this.filter('fastest').map('hz'),
    opsLow = this.filter('slowest').map('hz'),
    fasterBy = (opsHigh-opsLow)/opsLow;

  fasterBy >= 2 ? (fasterBy = ~~fasterBy + ' times') : (fasterBy = ~~(fasterBy*100) + ' %')
  console.log(`Fastest is ${this.filter('fastest').map('name')} faster by ${fasterBy} with the lowest`);
})
.run(
    // { 'async': true }
);