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/17.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 16 days ago

Test name	Executions per second
floor	4905662.0 Ops/sec
~~	8346382.0 Ops/sec
>> 0	8360852.0 Ops/sec
\| 0	8340542.0 Ops/sec
<< 0	8356959.0 Ops/sec
& 0xFFFFFFFFFFFF	8339355.0 Ops/sec
^ 0x000000000000	8361745.0 Ops/sec
Math.trunc()	4999561.0 Ops/sec
x - (x % 1)	4355253.0 Ops/sec
parseInt()	4917729.0 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)