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

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36
Chrome 110
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
toFixed(4) and parse 4356923.0 Ops/sec
toPrecision(4).toString() 6301973.5 Ops/sec
(Math.round(*10000)/10000).toString() 6687158.5 Ops/sec
Math.floor fast 18962240.0 Ops/sec
Script Preparation code:
AخA
 
var someFloat = 0.123456789;
Tests:

  • toFixed(4) and parse

     
    +someFloat.toFixed(4);

  • toPrecision(4).toString()

     
    someFloat.toPrecision(4);

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

    ​x
     
    (Math.round(someFloat*10000)/10000);
    ​

  • Math.floor fast

     
    ~~(someFloat * 10000) / 10000;