Run details:
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0
Firefox 80
Windows 7
Desktop
4 years ago
Test name Executions per second
toFixed(4) someFloat.toFixed(4); someFloat.t 4610603.5 Ops/sec
toPrecision(4).toString() 4348926.5 Ops/sec
(Math.round(*10000)/10000).toString() 68992736.0 Ops/sec
Math.floor fast 221090448.0 Ops/sec
Math.trunc 69063856.0 Ops/sec
Script Preparation code:
AخA
 
var someFloat = 0.123456789;
Tests:
  • toFixed(4) someFloat.toFixed(4); someFloat.t

     
    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;
  • Math.trunc

     
    Math.trunc(someFloat * 10000) / 10000;