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Created September 2, 2019 13:16
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Two arrays vs one array + type checking (http://jsbench.github.io/#67a3a2de9fc39278ee04812857b7338b) #jsbench #jsperf
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Two arrays vs one array + type checking</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>
Raw
suite.js
"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 typeA = [{foo: true},{foo: true},{foo: true},{foo: true},{foo: true}];
typeA.concat(typeA);
typeA.concat(typeA);
typeA.concat(typeA);
typeA.concat(typeA);
const typeB = [{foo: true},{foo: true},{foo: true},{foo: true},{foo: true}];
typeB.concat(typeB);
typeB.concat(typeB);
typeB.concat(typeB);
typeB.concat(typeB);
const mixed = [{foo: true, type: 'typeA'},{foo: true, type: 'typeB'},{foo: true, type: 'typeA'},{foo: true, type: 'typeB'},{foo: true, type: 'typeA'},{foo: true, type: 'typeB'},{foo: true, type: 'typeA'},{foo: true, type: 'typeB'},{foo: true, type: 'typeA'},{foo: true, type: 'typeB'},];
mixed.concat(mixed);
mixed.concat(mixed);
mixed.concat(mixed);
mixed.concat(mixed);
};
suite.add("for (let i = 0; i < typeA.length; i++) {", function () {
for (let i = 0; i < typeA.length; i++) {
typeA[i].bar = !typeA[i].foo;
}
for (let i = 0; i < typeB.length; i++) {
typeB[i].bar = typeB[i].foo;
}
});
suite.add("for (let i = 0; i < mixed.length; i++) {", function () {
for (let i = 0; i < mixed.length; i++) {
if (mixed[i].type === 'typeA') {
mixed[i].bar = !mixed[i].foo;
}
else if(mixed[i].type === 'typeB') {
mixed[i].bar = mixed[i].foo;
}
}
});
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("Two arrays vs one array + type checking");
console.log(new Array(30).join("-"));
suite.run();
});
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