node/benchmark/events/eventtarget-add-remove.js

'use strict';
const common = require('../common.js');

const bench = common.createBenchmark(main, {
  n: [1e6],
  nListener: [5, 10],
});

function main({ n, nListener }) {
  const target = new EventTarget();
  const listeners = [];
  for (let k = 0; k < nListener; k += 1)
    listeners.push(() => {});

  bench.start();
  for (let i = 0; i < n; i += 1) {
    const dummy = (i % 2 === 0) ? 'dummy0' : 'dummy1';
    for (let k = listeners.length; --k >= 0;) {
      target.addEventListener(dummy, listeners[k]);
    }
    for (let k = listeners.length; --k >= 0;) {
      target.removeEventListener(dummy, listeners[k]);
    }
  }
  bench.end(n);
}