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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
floor	6968416.0 Ops/sec
~~	11533570.0 Ops/sec
>> 0	11526990.0 Ops/sec
\| 0	11554950.0 Ops/sec
<< 0	11548130.0 Ops/sec
& 0xFFFFFFFFFFFF	11480530.0 Ops/sec
^ 0x000000000000	11489880.0 Ops/sec
Math.trunc()	6848104.0 Ops/sec
x - (x % 1)	7074121.0 Ops/sec
parseInt()	5554591.0 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)