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July 26, 2017 19:49
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Fastest decimal point check (http://jsbench.github.io/#458c639d6b581adde93cc64c340d1874) #jsbench #jsperf
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>Fastest decimal point check</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("+(Math.round(192.16826 + \"e+4\") + \"e-4\") === 192.16826", function () { | |
| +(Math.round(192.16826 + "e+4") + "e-4") === 192.16826 | |
| }); | |
| suite.add("function decimalPlaces(num) {", function () { | |
| function decimalPlaces(num) { | |
| var match = (''+num).match(/(?:\.(\d+))?(?:[eE]([+-]?\d+))?$/); | |
| if (!match) { return 0; } | |
| return Math.max( | |
| 0, | |
| // Number of digits right of decimal point. | |
| (match[1] ? match[1].length : 0) | |
| // Adjust for scientific notation. | |
| - (match[2] ? +match[2] : 0)); | |
| } | |
| decimalPlaces(192.16826) <= 4 | |
| }); | |
| suite.add("getPrecision = function(value) {", function () { | |
| getPrecision = function(value) { | |
| var v = value.valueOf(); | |
| if (Math.floor(v) === v) return 0; | |
| var str = value.toString(); | |
| var ep = str.split("e-"); | |
| if (ep.length > 1) { | |
| var np = Number(ep[0]); | |
| return np.getPrecision() + Number(ep[1]); | |
| } | |
| var dp = str.split("."); | |
| if (dp.length > 1) { | |
| return dp[1].length; | |
| } | |
| return 0; | |
| } | |
| getPrecision(192.16826) <= 4 | |
| }); | |
| 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("Fastest decimal point check"); | |
| console.log(new Array(30).join("-")); | |
| suite.run(); | |
| }); |
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