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boolean coercion (http://jsbench.github.io/#ce9b2e5764d01f6c261928f15d335f33) #jsbench #jsperf
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"/> | |
<title>boolean coercion</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 arr = [...Array(100).keys()]; | |
const obj_with_str = { | |
str_field: 'foo' | |
}; | |
const obj_with_null_str = { | |
str_field: null | |
}; | |
const obj_with_und_str = { | |
str_field: undefined | |
}; | |
}; | |
suite.add("double bang", function () { | |
// double bang | |
arr.forEach((id) => { | |
!!obj_with_str.str_field === true; | |
!!obj_with_null_str.str_field === false; | |
!!obj_with_und_str.str_field === false; | |
}); | |
}); | |
suite.add("boolean fn", function () { | |
// boolean fn | |
arr.forEach((id) => { | |
Boolean(obj_with_str.str_field) === true; | |
Boolean(obj_with_null_str.str_field) === false; | |
Boolean(obj_with_und_str.str_field) === false; | |
}); | |
}); | |
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("boolean coercion"); | |
console.log(new Array(30).join("-")); | |
suite.run(); | |
}); |
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