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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.1.2

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
floor	5755829.0 Ops/sec
~~	8344972.5 Ops/sec
>> 0	9133308.0 Ops/sec
\| 0	9045462.0 Ops/sec
<< 0	7237988.5 Ops/sec
& 0xFFFFFFFFFFFF	9118636.0 Ops/sec
^ 0x000000000000	8929345.0 Ops/sec
Math.trunc()	5470936.5 Ops/sec
x - (x % 1)	5179965.5 Ops/sec
parseInt()	4570700.5 Ops/sec

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)

;