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August 1, 2022 21:29
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String.replace vs RegExp.exec loop (https://jsbench.github.io/#0f971d52c8a86eb2c3e5983f5e8ebd0a) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>String.replace vs RegExp.exec loop</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 re = /```(?:(?!```)[^])*|<http[^|]*|\|http[^>]*|(\bVercel\b|\bNextJS\b)/gi; | |
| const short = "Vercel is awesome."; | |
| const long = short.repeat(100); | |
| function replace(text, re) { | |
| return text.replace(re, (match, term) => { | |
| if (term) return `*${term}*`; | |
| return match; | |
| }); | |
| } | |
| const replacer = (match, term) => { | |
| if (term) return `*${term}*`; | |
| return match; | |
| }; | |
| function replaceExtracted(text, re) { | |
| return text.replace(re, replacer); | |
| } | |
| function whileExec(text, re) { | |
| let match; | |
| let str = ''; | |
| let idx = 0; | |
| while ((match = re.exec(text))) { | |
| const term = match[1]; | |
| if (term) { | |
| str += text.slice(idx, match.index); | |
| str += `*${term}*`; | |
| idx = match.index + match[0].length; | |
| continue; | |
| } | |
| } | |
| return str + text.slice(idx); | |
| } | |
| }; | |
| suite.add("replace(short, re);", function () { | |
| replace(short, re); | |
| }); | |
| suite.add("replaceExtracted(short, re);", function () { | |
| replaceExtracted(short, re); | |
| }); | |
| suite.add("whileExec(short, re);", function () { | |
| whileExec(short, re); | |
| }); | |
| suite.add("replace(long, re);", function () { | |
| replace(long, re); | |
| }); | |
| suite.add("replaceExtracted(long, re);", function () { | |
| replaceExtracted(long, re); | |
| }); | |
| suite.add("whileExec(long, re);", function () { | |
| whileExec(long, re); | |
| }); | |
| 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("String.replace vs RegExp.exec loop"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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