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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_4_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 12

Operating system: iOS 12.4.5

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
toFixed(4)	1679292.0 Ops/sec
toPrecision(4).toString()	1560111.0 Ops/sec
(Math.round(*10000)/10000).toString()	1590391.0 Ops/sec
Math.floor fast	3725935.0 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;

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

toFixed(4)

toPrecision(4).toString()

(Math.round(*10000)/10000).toString()

Math.floor fast