Snippet: Example showing how to benchmark / compare functions

[trasherdk]

test.js

'use strict';

const benchmark = require('benchmark');

class Foo {}

const clients = [];

for (let i = 0; i < 1000; i++) {
  clients.push(new Foo());
}


function shuffle(arr) {
  let i, j, x;
  for (i = arr.length - 1; i > 0; i--) {
    j = Math.floor(Math.random() * (i + 1));
    x = arr[i];
    arr[i] = arr[j];
    arr[j] = x;
  }
}

function remove(element) {
  // To remove the element the corresponding index must be found first.
  for (let i = 0; i < array.length; i++) {
    if (array[i] === element) {
      array.splice(i, 1);
      break;
    }
  }
}

const array = [];
const set = new Set();
const suite = new benchmark.Suite();

suite.add('array', function () {
  let i;

  for (i = 0; i < clients.length; i++) {
    array.push(clients[i]);
  }

  shuffle(clients);

  for (i = 0; i < clients.length; i++) {
    remove(clients[i]);
  }
});

suite.add('set', function () {
  let i;

  for (i = 0; i < clients.length; i++) {
    set.add(clients[i]);
  }

  shuffle(clients);

  for (i = 0; i < clients.length; i++) {
    set.delete(clients[i]);
  }
});

suite.on('cycle', function (event) {
  console.log(event.target.toString());
});

suite.on('complete', function () {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
});

suite.run({ async: true });

$ node test.js
array x 3,413 ops/sec ±1.71% (85 runs sampled)
set x 9,977 ops/sec ±4.04% (73 runs sampled)
Fastest is set

Source: websockets#2044 (comment)