bench-stop-foreach.js

'use strict';
var Benchmark = require('benchmark');
var _ = require('lodash');
var suite = new Benchmark.Suite;
var a = [1, 2, 3];
var stopIteration = new Error('stop iteration');

// add tests
suite
.add('native-for-break', function() {
	for (var i = 0, len = a.length; i < len; i++) {
		break;
	}
})
.add('native-foreach-throw', function() {
	try {
		a.forEach(function () {
			throw stopIteration;
		})
	} catch(e) {
		if (e !== stopIteration) {
			throw e;
		}
	}
})
.add('native-every', function() {
	a.every(function () {
		return false;
	})
})
.add('lodash-foreach', function() {
	_.forEach(a, function () {
		return false;
	});
})
.add('lodash-foreach-throw', function() {
	try {
		_.forEach(a, function () {
			throw stopIteration;
		})
	} catch(e) {
		if (e !== stopIteration) {
			throw e;
		}
	}
})
// add listeners
.on('cycle', function(event) {
	console.log(String(event.target));
})
.on('complete', function() {
	console.log('Fastest is ' + this.filter('fastest').map('name'));
})
// run async
.run({async: true});

// Output:
// native-for-break x 92,777,547 ops/sec ±0.94% (90 runs sampled)
// native-foreach-throw x 1,239,034 ops/sec ±0.66% (82 runs sampled)
// native-every x 20,965,765 ops/sec ±0.65% (83 runs sampled)
// lodash-foreach x 17,027,859 ops/sec ±0.57% (90 runs sampled)
// lodash-foreach-throw x 1,352,385 ops/sec ±0.56% (93 runs sampled)
// Fastest is native-for-break