MeasureThat.net

Run results for: floor() vs trunc() vs bitwise hacks (~~, >> 0, etc)

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Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Mobile/15E148 Safari/604.1
Mobile Safari 14
iOS 14.4.2
Mobile
4 years ago
Test name Executions per second
floor 5525310.0 Ops/sec
~~ 8543164.0 Ops/sec
>> 0 8463518.0 Ops/sec
| 0 8239861.0 Ops/sec
<< 0 8109767.5 Ops/sec
& 0xFFFFFFFFFFFF 8046047.5 Ops/sec
^ 0x000000000000 8039978.0 Ops/sec
Math.trunc() 4932540.5 Ops/sec
x - (x % 1) 4762514.0 Ops/sec
parseInt() 3412963.5 Ops/sec
Script Preparation code:
AخA
 
var x = Math.random() * 100000000;
var y;
Tests:

  • floor

     
    y = Math.floor(x);

  • ~~

     
    y = ~~x;

  • >> 0

     
    y = x >> 0;

  • | 0

     
    y = x | 0;

  • << 0

     
    y = x << 0;

  • & 0xFFFFFFFFFFFF

     
    y = x & 0xFFFFFFFFFFFF;

  • ^ 0x000000000000

     
    y = x ^ 0x000000000000;

  • Math.trunc()

     
    y = Math.trunc(x);

  • x - (x % 1)

     
    y = x - (x % 1);

  • parseInt()

     
    y = parseInt(x)