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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36 OPR/41.0.2353.69

Browser: Opera 41

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
floor	1791621.9 Ops/sec
~~	3323767.5 Ops/sec
>> 0	3273829.2 Ops/sec
\| 0	3150303.0 Ops/sec
<< 0	3100909.2 Ops/sec
& 0xFFFFFFFFFFFF	3137727.2 Ops/sec
^ 0x000000000000	3287037.5 Ops/sec
Math.trunc()	1694126.1 Ops/sec
x - (x % 1)	2200330.0 Ops/sec
parseInt()	1766908.1 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)

;