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_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
floor	3210192.0 Ops/sec
~~	5618326.0 Ops/sec
>> 0	5636475.0 Ops/sec
\| 0	5643876.0 Ops/sec
<< 0	5646532.0 Ops/sec
& 0xFFFFFFFFFFFF	5626099.0 Ops/sec
^ 0x000000000000	5589204.0 Ops/sec
Math.trunc()	3280310.0 Ops/sec
x - (x % 1)	3705066.0 Ops/sec
parseInt()	2924251.0 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)