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October 9, 2017 21:52
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Lazy Values (https://jsbench.github.io/#3da95139f6e8599bd44386e958220621) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>Lazy Values</title> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script> | |
| <script src="./suite.js"></script> | |
| </head> | |
| <body> | |
| <h1>Open the console to view the results</h1> | |
| <h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2> | |
| </body> | |
| </html> |
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| "use strict"; | |
| (function (factory) { | |
| if (typeof Benchmark !== "undefined") { | |
| factory(Benchmark); | |
| } else { | |
| factory(require("benchmark")); | |
| } | |
| })(function (Benchmark) { | |
| var suite = new Benchmark.Suite; | |
| Benchmark.prototype.setup = function () { | |
| function defineLazyValue(obj, prop, initializer, writable) { | |
| Object.defineProperty(obj, prop, { | |
| configurable: true, | |
| get: function () { | |
| Object.defineProperty(this, prop, { | |
| value: undefined, | |
| writable: true | |
| }); | |
| var value = initializer.call(this, obj, prop); | |
| Object.defineProperty(this, prop, { | |
| value: value, | |
| writable: !!writable | |
| }); | |
| return value; | |
| }, | |
| set: function (value) { | |
| Object.defineProperty(this, prop, { | |
| value: value, | |
| writable: !!writable | |
| }); | |
| return value; | |
| } | |
| }); | |
| } | |
| var _id = 1; | |
| function getUniqueId() { | |
| return _id++; | |
| } | |
| function MyObjWithNoID(){} | |
| function MyObj() { | |
| this.id = getUniqueId(); | |
| } | |
| function MyObjWithLazyId() {} | |
| defineLazyValue(MyObjWithLazyId.prototype, 'id', getUniqueId); | |
| }; | |
| suite.add("new MyObjWithNoID();", function () { | |
| new MyObjWithNoID(); | |
| }); | |
| suite.add("new MyObj();", function () { | |
| new MyObj(); | |
| }); | |
| suite.add("new MyObjWithLazyId();", function () { | |
| new MyObjWithLazyId(); | |
| }); | |
| suite.on("cycle", function (evt) { | |
| console.log(" - " + evt.target); | |
| }); | |
| suite.on("complete", function (evt) { | |
| console.log(new Array(30).join("-")); | |
| var results = evt.currentTarget.sort(function (a, b) { | |
| return b.hz - a.hz; | |
| }); | |
| results.forEach(function (item) { | |
| console.log((idx + 1) + ". " + item); | |
| }); | |
| }); | |
| console.log("Lazy Values"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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