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

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:103.0) Gecko/20100101 Firefox/103.0

Browser: Firefox 103

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
toFixed(4)	8353920.0 Ops/sec
toPrecision(4).toString()	6615175.0 Ops/sec
(Math.round(*10000)/10000).toString()	861041408.0 Ops/sec
toLocaleString("en-gb", {minimumFractionDigits: 0, maximumFractionDigits: 4})	21267.7 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})