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Use benchmark package (npm install benchmark, https://benchmarkjs.com/).
A simple benchmark in node:
var Benchmark = require('benchmark');

var suite = new Benchmark.Suite;

function f1() {
	return ['foo', 'bar'].includes('zeta');

var known = ['foo', 'bar'];
function f2() {
	return known.includes('zeta');

suite.add('f1', f1);
suite.add('f2', f2);
suite.on('cycle', function(event) {
suite.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
suite.run({ 'async': true });

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