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Run results for:
toFixed vs toPrecision vs Math.round() vs Math.floorfast vs MDN round_to_precision
Added MDN round to precision function: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
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<iframe src="https://measurethat.net/Embed?id=506781" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Math.floor fast
12.5M/s
toFixed(4)
6.2M/s
(Math.round(*10000)/10000).toString()
5.4M/s
toPrecision(4).toString()
5.3M/s
precisition round
2.3M/s
View exact numbers
Test name
Executions per second
✓
Math.floor fast
12,503,584 Ops/sec
toFixed(4)
6,213,265 Ops/sec
(Math.round(*10000)/10000).toString()
5,403,558 Ops/sec
toPrecision(4).toString()
5,322,873 Ops/sec
precisition round
2,342,104 Ops/sec
Script Preparation code:
var someFloat = 0.123456789; var round_to_precision = function (x, precision) { var y = +x + (precision === undefined ? 0.5 : precision/2); return y - (y % (precision === undefined ? 1 : +precision)); };
Tests:
toFixed(4)
someFloat.toFixed(4);
toPrecision(4).toString()
someFloat.toPrecision(4);
(Math.round(*10000)/10000).toString()
(Math.round(someFloat*10000)/10000);
Math.floor fast
~~(someFloat * 10000) / 10000;
precisition round
round_to_precision(someFloat, 4);