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Array read #jsbench #jsperf (http://jsbench.github.io/#b5e7fcb3513d4c3e8971335148cb5b65) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>Array read #jsbench #jsperf</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 () { | |
| const length = 10000; | |
| const naiveArray = []; | |
| for(let i = 0; i < length; i++) { | |
| naiveArray.push(true); | |
| } | |
| const preallocatedArray = new Array(length); | |
| for(let i = 0; i < length; i++) { | |
| preallocatedArray[i] = true; | |
| } | |
| }; | |
| suite.add("naive", function () { | |
| // naive | |
| let result; | |
| for(let i = 0; i < length; i++) { | |
| result = naiveArray[i]; | |
| } | |
| /* | |
| Conclusion (Chrome & FF): Naive arrays are faster for reads than preallocated, because naive are PACKED and preallocated are HOLEY | |
| See: | |
| https://github.com/babel/babel/issues/6233 | |
| https://v8.dev/blog/elements-kinds | |
| */ | |
| }); | |
| suite.add("preallocated", function () { | |
| // preallocated | |
| let result; | |
| for(let i = 0; i < length; i++) { | |
| result = preallocatedArray[i]; | |
| } | |
| }); | |
| 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("Array read #jsbench #jsperf"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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