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Last active July 25, 2019 11:33
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Perf cost of destructuring assignment (http://jsbench.github.io/#e0d09623a085372ec6dcdf66a34612fb) #jsbench #jsperf
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Perf cost of destructuring assignment</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>
"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 dataAsArrayOfObjects = [
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
{r: 1, g: 1, b: 1},
];
};
suite.add("let i = dataAsArrayOfObjects.length;", function () {
let i = dataAsArrayOfObjects.length;
while(i--) {
const sum = dataAsArrayOfObjects[i].r + dataAsArrayOfObjects[i].g + dataAsArrayOfObjects[i].b;
}
});
suite.add("let i = dataAsArrayOfObjects.length;", function () {
let i = dataAsArrayOfObjects.length;
while(i--) {
const item = dataAsArrayOfObjects[i];
const sum = item.r + item.g + item.b;
}
});
suite.add("let i = dataAsArrayOfObjects.length;", function () {
let i = dataAsArrayOfObjects.length;
while(i--) {
const { r, g, b } = dataAsArrayOfObjects[i];
const sum = r + g + b;
}
});
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("Perf cost of destructuring assignment");
console.log(new Array(30).join("-"));
suite.run();
});
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