Run results for: toFixed vs toPrecision vs Math.round() vs Math.floorfast - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36

Browser: Chrome 76

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
toFixed(4)	1155889.6 Ops/sec
toPrecision(4).toString()	1426168.8 Ops/sec
(Math.round(*10000)/10000).toString()	1804164.9 Ops/sec
Math.floor fast	5392235.5 Ops/sec

Script Preparation code:

var someFloat = 0.123456789;

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;

;