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

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/118.0

Browser: Firefox 118

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
floor	193061800.0 Ops/sec
~~	196643000.0 Ops/sec
>> 0	202747900.0 Ops/sec
\| 0	197310200.0 Ops/sec
<< 0	194316000.0 Ops/sec
& 0xFFFFFFFFFFFF	195474100.0 Ops/sec
^ 0x000000000000	197869200.0 Ops/sec
Math.trunc()	204901000.0 Ops/sec
x - (x % 1)	339901800.0 Ops/sec
parseInt()	200964300.0 Ops/sec

Website performance monitoring

Script Preparation code:

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)