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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 LightSpeed [FBAN/MessengerLiteForiOS;FBAV/369.0.0.11.107;FBBV/381862875;FBDV/iPhone12,1;FBMD/iPhone;FBSN/iOS;FBSV/15.6;FBSS/2;FBCR/;FBID/phone;FBLC/da;FBOP/0]

Browser: Mobile Safari 15

Operating system: iOS 15.6

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
toFixed(4)	5936474.0 Ops/sec
toPrecision(4).toString()	5443601.0 Ops/sec
(Math.round(*10000)/10000).toString()	5743666.5 Ops/sec
toLocaleString("en-gb", {minimumFractionDigits: 0, maximumFractionDigits: 4})	33332.1 Ops/sec

Script Preparation code:

var someFloat = 0.123456789;

Tests:

toFixed(4)
someFloat.toFixed(4);
toPrecision(4).toString()
someFloat.toPrecision(4).toString();
(Math.round(*10000)/10000).toString()
(Math.round(someFloat*10000)/10000).toString();
toLocaleString("en-gb", {minimumFractionDigits: 0, maximumFractionDigits: 4})
someFloat.toLocaleString("en-gb", {minimumFractionDigits: 0, maximumFractionDigits: 4})

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

toFixed(4)

toPrecision(4).toString()

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

toLocaleString("en-gb", {minimumFractionDigits: 0, maximumFractionDigits: 4})