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November 8, 2018 23:53
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Iterating over collections of elements (http://jsbench.github.io/#33a883c12f8c75cd5e62bdf12359b8e0) #jsbench #jsperf
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"/> | |
<title>Iterating over collections of elements</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 () { | |
var div = document.createElement('div'); | |
for (let i = 0; i < 500; i++) { | |
div.appendChild(document.createElement('div')); | |
} | |
function noop(o) { return o; } | |
}; | |
suite.add("Simple for loop undefined, static list", function () { | |
// Simple for loop undefined, static list | |
var elements = div.querySelectorAll('div'); | |
for (var i = 0; elements[i] != undefined; i++) { | |
noop(elements[i]); | |
} | |
}); | |
suite.add("Complex for loop undefined, static list", function () { | |
// Complex for loop undefined, static list | |
var elements = div.querySelectorAll('div'); | |
for (var i = 0, element; (element = elements[i]) != undefined; i++) { | |
noop(element); | |
} | |
}); | |
suite.add("Length, static list", function () { | |
// Length, static list | |
var elements = div.querySelectorAll('div'); | |
for (var i = 0; i < elements.length; i++) { | |
noop(elements[i]); | |
} | |
}); | |
suite.add("Cached Length, static list", function () { | |
// Cached Length, static list | |
var elements = div.querySelectorAll('div'); | |
for (var i = 0, length = elements.length; i < length; i++) { | |
noop(elements[i]); | |
} | |
}); | |
suite.add("Simple for loop undefined, live list", function () { | |
// Simple for loop undefined, live list | |
var elements = div.children; | |
for (var i = 0; elements[i] != undefined; i++) { | |
noop(elements[i]); | |
} | |
}); | |
suite.add("Complex for loop undefined, live list", function () { | |
// Complex for loop undefined, live list | |
var elements = div.children; | |
for (var i = 0, element; (element = elements[i]) != undefined; i++) { | |
noop(element); | |
} | |
}); | |
suite.add("Length, live list", function () { | |
// Length, live list | |
var elements = div.children; | |
for (var i = 0; i < elements.length; i++) { | |
noop(elements[i]); | |
} | |
}); | |
suite.add("Cached Length, live list", function () { | |
// Cached Length, live list | |
var elements = div.children; | |
for (var i = 0, length = elements.length; i < length; i++) { | |
noop(elements[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("Iterating over collections of elements"); | |
console.log(new Array(30).join("-")); | |
suite.run(); | |
}); |
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