MeasureThat.net

Run results for: Comparing performance of Math.floor(x); vs Math.round(x); vs (0.5 + x) << 0;

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36
Chrome 106
Windows
Desktop
2 years ago
Test name Executions per second
Math.floor(x); 4892083.5 Ops/sec
Math.round(x) 4846916.0 Ops/sec
(0.5 + x) << 0; 9476035.0 Ops/sec
Script Preparation code:
AخA
 
var x = Math.random() * 100000000;
var y;
Tests:

  • Math.floor(x);

     
    y=Math.floor(x);

  • Math.round(x)

     
    y=Math.round(x)

  • (0.5 + x) << 0;

     
    y=(0.5 + x) << 0;