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Decimal Rounding - Exponential notation vs Number.EPSILON vs Double rounding vs Double rounding v2 #jsbench (http://jsbench.github.io/#31ec3a8b3d22bd840f8e6822e681a3ac) #jsbench #jsperf
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Decimal Rounding - Exponential notation vs Number.EPSILON vs Double rounding vs Double rounding v2 #jsbench</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 () {
// Solution 1
var DecimalPrecision = (function() {
if (Math.sign === undefined) {
Math.sign = function(x) {
return ((x > 0) - (x < 0)) || +x;
};
}
if (Math.trunc === undefined) {
Math.trunc = function(v) {
return v < 0 ? Math.ceil(v) : Math.floor(v);
};
}
return {
// Decimal round (half away from zero)
round: function(num, decimalPlaces) {
num = (num + 'e').split('e');
num = Math.round(Math.abs(+num[0]) + 'e' + (+num[1] + decimalPlaces)) * Math.sign(+num[0]);
num = (num + 'e').split('e');
return +(num[0] + 'e' + (+num[1] - decimalPlaces));
},
// Decimal ceil
ceil: function(num, decimalPlaces) {
num = (num + 'e').split('e');
num = Math.ceil(num[0] + 'e' + (+num[1] + decimalPlaces));
num = (num + 'e').split('e');
return +(num[0] + 'e' + (+num[1] - decimalPlaces));
},
// Decimal floor
floor: function(num, decimalPlaces) {
num = (num + 'e').split('e');
num = Math.floor(num[0] + 'e' + (+num[1] + decimalPlaces));
num = (num + 'e').split('e');
return +(num[0] + 'e' + (+num[1] - decimalPlaces));
},
// Decimal trunc
trunc: function(num, decimalPlaces) {
num = (num + 'e').split('e');
num = Math.trunc(num[0] + 'e' + (+num[1] + decimalPlaces));
num = (num + 'e').split('e');
return +(num[0] + 'e' + (+num[1] - decimalPlaces));
}
};
})();
// Solution 2
var DecimalPrecision2 = (function() {
if (Number.EPSILON === undefined) {
Number.EPSILON = Math.pow(2, -52);
}
if (Math.trunc === undefined) {
Math.trunc = function(v) {
return v < 0 ? Math.ceil(v) : Math.floor(v);
};
}
return {
isRound: function(num, decimalPlaces) {
//return this.round(num, decimalPlaces) === num;
return decimalPlaces >= 0 &&
+num.toFixed(decimalPlaces) === num;
},
// Decimal round (half away from zero)
round: function(num, decimalPlaces) {
var p = Math.pow(10, decimalPlaces);
var e = Number.EPSILON * num * p;
return Math.round((num * p) + e) / p;
},
// Decimal ceil
ceil: function(num, decimalPlaces) {
if (this.isRound(num, decimalPlaces))
return num;
var p = Math.pow(10, decimalPlaces);
return Math.ceil(num * p) / p;
},
// Decimal floor
floor: function(num, decimalPlaces) {
if (this.isRound(num, decimalPlaces))
return num;
var p = Math.pow(10, decimalPlaces);
return Math.floor(num * p) / p;
},
// Decimal trunc
trunc: function(num, decimalPlaces) {
if (this.isRound(num, decimalPlaces))
return num;
var p = Math.pow(10, decimalPlaces);
return Math.trunc(num * p) / p;
}
};
})();
// Solution 3
var DecimalPrecision3 = (function() {
if (Math.sign === undefined) {
Math.sign = function(x) {
return ((x > 0) - (x < 0)) || +x;
};
}
if (Math.trunc === undefined) {
Math.trunc = function(v) {
return v < 0 ? Math.ceil(v) : Math.floor(v);
};
}
// Eliminate floating-point inaccuracies.
var strip = function(num) {
return parseFloat((num).toPrecision(15));
};
return {
// Decimal round (half away from zero)
round: function(num, decimalPlaces) {
var p = Math.pow(10, decimalPlaces);
var r = Math.round(strip(Math.abs(num) * p)) / p;
return Math.sign(num) * r;
},
// Decimal ceil
ceil: function(num, decimalPlaces) {
var p = Math.pow(10, decimalPlaces);
return Math.ceil(strip(num * p)) / p;
},
// Decimal floor
floor: function(num, decimalPlaces) {
var p = Math.pow(10, decimalPlaces);
return Math.floor(strip(num * p)) / p;
},
// Decimal trunc
trunc: function(num, decimalPlaces) {
var p = Math.pow(10, decimalPlaces);
return Math.trunc(strip(num * p)) / p;
}
};
})();
// Solution 4
var DecimalPrecision4 = (function() {
if (Math.trunc === undefined) {
Math.trunc = function(v) {
return v < 0 ? Math.ceil(v) : Math.floor(v);
};
}
return {
// Decimal round (half away from zero)
round: function(num, decimalPlaces) {
var d = decimalPlaces || 0;
var m = Math.pow(10, d);
var n = +(d ? num * m : num).toFixed(8);
var i = Math.floor(n), f = n - i;
var e = 1e-8; // Allow for rounding errors in f
var r = (f > 0.5 - e && f < 0.5 + e) ?
((n < 0) ? i : i + 1) :
Math.round(n);
return d ? r / m : r;
},
// Decimal ceil
ceil: function(num, decimalPlaces) {
var d = decimalPlaces || 0;
var m = Math.pow(10, d);
var n = +(d ? num * m : num).toFixed(8);
var i = Math.ceil(n);
return d ? i / m : i;
},
// Decimal floor
floor: function(num, decimalPlaces) {
var d = decimalPlaces || 0;
var m = Math.pow(10, d);
var n = +(d ? num * m : num).toFixed(8);
var i = Math.floor(n);
return d ? i / m : i;
},
// Decimal trunc
trunc: function(num, decimalPlaces) {
var d = decimalPlaces || 0;
var m = Math.pow(10, d);
var n = +(d ? num * m : num).toFixed(8);
var i = Math.trunc(n);
return d ? i / m : i;
}
};
})();
};
suite.add("Solution 1 (Exponential notation)", function () {
/** Solution 1 (Exponential notation) **/
DecimalPrecision.round(0.5, 0);
DecimalPrecision.round(-0.5, 0);
DecimalPrecision.ceil(1e-8, 2);
DecimalPrecision.floor(1e-8, 2);
DecimalPrecision.round(5.12, 1);
DecimalPrecision.round(-5.12, 1);
DecimalPrecision.ceil(5.12, 1);
DecimalPrecision.ceil(-5.12, 1);
DecimalPrecision.floor(5.12, 1);
DecimalPrecision.floor(-5.12, 1);
DecimalPrecision.trunc(5.12, 1);
DecimalPrecision.trunc(-5.12, 1);
DecimalPrecision.round(1.005, 2);
DecimalPrecision.round(39.425, 2);
DecimalPrecision.round(-1.005, 2);
DecimalPrecision.round(-39.425, 2);
DecimalPrecision.ceil(9.130, 2);
DecimalPrecision.ceil(65.180, 2);
DecimalPrecision.ceil(-2.260, 2);
DecimalPrecision.ceil(-18.150, 2);
DecimalPrecision.floor(2.260, 2);
DecimalPrecision.floor(18.150, 2);
DecimalPrecision.floor(-9.130, 2);
DecimalPrecision.floor(-65.180, 2);
DecimalPrecision.trunc(2.260, 2);
DecimalPrecision.trunc(18.150, 2);
DecimalPrecision.trunc(-2.260, 2);
DecimalPrecision.trunc(-18.150, 2);
DecimalPrecision.round(1262.48, -1);
DecimalPrecision.round(1262.48, -2);
});
suite.add("Solution 2 (Epsilon correction)", function () {
/** Solution 2 (Epsilon correction) **/
DecimalPrecision2.round(0.5, 0);
DecimalPrecision2.round(-0.5, 0);
DecimalPrecision2.ceil(1e-8, 2);
DecimalPrecision2.floor(1e-8, 2);
DecimalPrecision2.round(5.12, 1);
DecimalPrecision2.round(-5.12, 1);
DecimalPrecision2.ceil(5.12, 1);
DecimalPrecision2.ceil(-5.12, 1);
DecimalPrecision2.floor(5.12, 1);
DecimalPrecision2.floor(-5.12, 1);
DecimalPrecision2.trunc(5.12, 1);
DecimalPrecision2.trunc(-5.12, 1);
DecimalPrecision2.round(1.005, 2);
DecimalPrecision2.round(39.425, 2);
DecimalPrecision2.round(-1.005, 2);
DecimalPrecision2.round(-39.425, 2);
DecimalPrecision2.ceil(9.130, 2);
DecimalPrecision2.ceil(65.180, 2);
DecimalPrecision2.ceil(-2.260, 2);
DecimalPrecision2.ceil(-18.150, 2);
DecimalPrecision2.floor(2.260, 2);
DecimalPrecision2.floor(18.150, 2);
DecimalPrecision2.floor(-9.130, 2);
DecimalPrecision2.floor(-65.180, 2);
DecimalPrecision2.trunc(2.260, 2);
DecimalPrecision2.trunc(18.150, 2);
DecimalPrecision2.trunc(-2.260, 2);
DecimalPrecision2.trunc(-18.150, 2);
DecimalPrecision2.round(1262.48, -1);
DecimalPrecision2.round(1262.48, -2);
});
suite.add("Solution 3 (Double rounding)", function () {
/** Solution 3 (Double rounding) **/
DecimalPrecision3.round(0.5, 0);
DecimalPrecision3.round(-0.5, 0);
DecimalPrecision3.ceil(1e-8, 2);
DecimalPrecision3.floor(1e-8, 2);
DecimalPrecision3.round(5.12, 1);
DecimalPrecision3.round(-5.12, 1);
DecimalPrecision3.ceil(5.12, 1);
DecimalPrecision3.ceil(-5.12, 1);
DecimalPrecision3.floor(5.12, 1);
DecimalPrecision3.floor(-5.12, 1);
DecimalPrecision3.trunc(5.12, 1);
DecimalPrecision3.trunc(-5.12, 1);
DecimalPrecision3.round(1.005, 2);
DecimalPrecision3.round(39.425, 2);
DecimalPrecision3.round(-1.005, 2);
DecimalPrecision3.round(-39.425, 2);
DecimalPrecision3.ceil(9.130, 2);
DecimalPrecision3.ceil(65.180, 2);
DecimalPrecision3.ceil(-2.260, 2);
DecimalPrecision3.ceil(-18.150, 2);
DecimalPrecision3.floor(2.260, 2);
DecimalPrecision3.floor(18.150, 2);
DecimalPrecision3.floor(-9.130, 2);
DecimalPrecision3.floor(-65.180, 2);
DecimalPrecision3.trunc(2.260, 2);
DecimalPrecision3.trunc(18.150, 2);
DecimalPrecision3.trunc(-2.260, 2);
DecimalPrecision3.trunc(-18.150, 2);
DecimalPrecision3.round(1262.48, -1);
DecimalPrecision3.round(1262.48, -2);
});
suite.add("Solution 4 (Double rounding v2)", function () {
/** Solution 4 (Double rounding v2) **/
DecimalPrecision4.round(0.5, 0);
DecimalPrecision4.round(-0.5, 0);
DecimalPrecision4.ceil(1e-8, 2);
DecimalPrecision4.floor(1e-8, 2);
DecimalPrecision4.round(5.12, 1);
DecimalPrecision4.round(-5.12, 1);
DecimalPrecision4.ceil(5.12, 1);
DecimalPrecision4.ceil(-5.12, 1);
DecimalPrecision4.floor(5.12, 1);
DecimalPrecision4.floor(-5.12, 1);
DecimalPrecision4.trunc(5.12, 1);
DecimalPrecision4.trunc(-5.12, 1);
DecimalPrecision4.round(1.005, 2);
DecimalPrecision4.round(39.425, 2);
DecimalPrecision4.round(-1.005, 2);
DecimalPrecision4.round(-39.425, 2);
DecimalPrecision4.ceil(9.130, 2);
DecimalPrecision4.ceil(65.180, 2);
DecimalPrecision4.ceil(-2.260, 2);
DecimalPrecision4.ceil(-18.150, 2);
DecimalPrecision4.floor(2.260, 2);
DecimalPrecision4.floor(18.150, 2);
DecimalPrecision4.floor(-9.130, 2);
DecimalPrecision4.floor(-65.180, 2);
DecimalPrecision4.trunc(2.260, 2);
DecimalPrecision4.trunc(18.150, 2);
DecimalPrecision4.trunc(-2.260, 2);
DecimalPrecision4.trunc(-18.150, 2);
DecimalPrecision4.round(1262.48, -1);
DecimalPrecision4.round(1262.48, -2);
});
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("Decimal Rounding - Exponential notation vs Number.EPSILON vs Double rounding vs Double rounding v2 #jsbench");
console.log(new Array(30).join("-"));
suite.run();
});
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