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benchmark of String.startsWith equivalents in Node.js
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| var Benchmark = require('benchmark'); | |
| Benchmark.prototype.setup = function() { | |
| a = ["test"]; | |
| for (var i = 0; i < 10000; i++) { | |
| a.push("some other stuff"); | |
| } | |
| s = a.join(); | |
| re1 = new RegExp("^test"); | |
| re2 = new RegExp("^not there"); | |
| }; | |
| var suite = new Benchmark.Suite(); | |
| // add tests | |
| suite.add('indexOf', function() { | |
| var r1 = (s.indexOf("test") === 0); | |
| var r2 = (s.indexOf("not there") === 0); | |
| }) | |
| .add('startsWith', function() { | |
| var r1 = (s.startsWith("test", 0) === 0); | |
| var r2 = (s.startsWith("not there", 0) === 0); | |
| }) | |
| .add('lastIndexOf', function() { | |
| var r1 = (s.lastIndexOf("test", 0) === 0); | |
| var r2 = (s.lastIndexOf("not there", 0) === 0); | |
| }) | |
| .add('substring', function() { | |
| var r1 = (s.substring(0, "test".length) == "test"); | |
| var r2 = (s.substring(0, "not there".length) == "not there"); | |
| }) | |
| .add('slice', function() { | |
| var r1 = (s.slice(0, "test".length) == "test"); | |
| var r2 = (s.slice(0, "not there".length) == "not there"); | |
| }) | |
| .add('regex', function() { | |
| var r1 = (/^test/).test(s); | |
| var r2 = (/^not there/).test(s); | |
| }) | |
| .add('compiled regex', function() { | |
| var r1 = re1.test(s); | |
| var r2 = re2.test(s); | |
| }) | |
| // add listeners | |
| .on('cycle', function(event) { | |
| console.log(String(event.target)); | |
| }) | |
| .on('complete', function() { | |
| console.log('Fastest is ' + this.filter('fastest').pluck('name')); | |
| }) | |
| // run async | |
| .run({ | |
| 'async': false | |
| }); |
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Update now that node actually does support
String.startsWithindexOf x 90,718 ops/sec ±3.66% (83 runs sampled)
startsWith x 7,861,168 ops/sec ±1.22% (84 runs sampled)
lastIndexOf x 11,840,350 ops/sec ±0.88% (88 runs sampled)
substring x 9,315,588 ops/sec ±1.24% (86 runs sampled)
slice x 9,203,373 ops/sec ±1.03% (91 runs sampled)
regex x 6,537,699 ops/sec ±1.25% (90 runs sampled)
compiled regex x 6,862,322 ops/sec ±1.25% (88 runs sampled)
substring and slice are about the same, and clearly the fastest