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caching array length (http://jsbench.github.io/#1e5e7b15abe4e5be288ddfa6f23ec885) #jsbench #jsperf
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"/> | |
<title>caching array length</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 arr10 = new Array(10); | |
const arr100 = new Array(100); | |
const arr1000 = new Array(1000); | |
const arr10000 = new Array(10000); | |
const arr100000 = new Array(100000); | |
}; | |
suite.add("for (var i=0; i<arr10.length; i++) {}", function () { | |
for (var i=0; i<arr10.length; i++) {} | |
}); | |
suite.add("for (var i=0, len=arr10.length; i<len; i++) {}", function () { | |
for (var i=0, len=arr10.length; i<len; i++) {} | |
}); | |
suite.add("for (var i=0; i<arr100.length; i++) {}", function () { | |
for (var i=0; i<arr100.length; i++) {} | |
}); | |
suite.add("for (var i=0, len=arr100.length; i<len; i++) {}", function () { | |
for (var i=0, len=arr100.length; i<len; i++) {} | |
}); | |
suite.add("for (var i=0; i<arr1000.length; i++) {}", function () { | |
for (var i=0; i<arr1000.length; i++) {} | |
}); | |
suite.add("for (var i=0, len=arr1000.length; i<len; i++) {}", function () { | |
for (var i=0, len=arr1000.length; i<len; i++) {} | |
}); | |
suite.add("for (var i=0; i<arr10000.length; i++) {}", function () { | |
for (var i=0; i<arr10000.length; i++) {} | |
}); | |
suite.add("for (var i=0, len=arr10000.length; i<len; i++) {}", function () { | |
for (var i=0, len=arr10000.length; i<len; i++) {} | |
}); | |
suite.add("for (var i=0; i<arr100000.length; i++) {}", function () { | |
for (var i=0; i<arr100000.length; i++) {} | |
}); | |
suite.add("for (var i=0, len=arr100000.length; i<len; i++) {}", function () { | |
for (var i=0, len=arr100000.length; i<len; 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("caching array length"); | |
console.log(new Array(30).join("-")); | |
suite.run(); | |
}); |
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