Created
January 6, 2019 13:15
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map spread syntax vs array.from() (http://jsbench.github.io/#d49615e81a0dbbea767953e2f805754a) #jsbench #jsperf
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"/> | |
<title>map spread syntax vs array.from()</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 map = (() => { | |
const res = new Map(); | |
for (let i = 0; i < 1000; i++) { | |
res.set(`a${i}`, i * 100); | |
} | |
return res; | |
})(); | |
}; | |
suite.add("const a = Array.from(map.entries());", function () { | |
const a = Array.from(map.entries()); | |
}); | |
suite.add("const b = [...map.entries()]", function () { | |
const b = [...map.entries()] | |
}); | |
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("map spread syntax vs array.from()"); | |
console.log(new Array(30).join("-")); | |
suite.run(); | |
}); |
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