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February 25, 2019 16:40
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startsWith vs substring(0, len) vs slice(0, len) vs Regex vs poor code (https://jsbench.github.io/#d1c0b1724c97327d28fc8d282bac71f9) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>startsWith vs substring(0, len) vs slice(0, len) vs Regex vs poor code</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; | |
| suite.add("\"string\".startsWith(\"str\");", function () { | |
| "string".startsWith("str"); | |
| }); | |
| suite.add("\"string\".substring(0, \"str\".length) === \"str\";", function () { | |
| "string".substring(0, "str".length) === "str"; | |
| }); | |
| suite.add("\"string\".slice(0, \"str\".length) === \"str\";", function () { | |
| "string".slice(0, "str".length) === "str"; | |
| }); | |
| suite.add("/^str/.test(\"string\")", function () { | |
| /^str/.test("string") | |
| }); | |
| suite.add("\"string\"[0] === \"s\" && \"string\"[1] === \"t\" && \"string\"[2] === \"r\"", function () { | |
| "string"[0] === "s" && "string"[1] === "t" && "string"[2] === "r" | |
| }); | |
| 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("startsWith vs substring(0, len) vs slice(0, len) vs Regex vs poor code"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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