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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser: Chrome 75

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
floor	2061538.0 Ops/sec
~~	3473941.0 Ops/sec
>> 0	3490225.0 Ops/sec
\| 0	3480389.0 Ops/sec
<< 0	3471241.0 Ops/sec
& 0xFFFFFFFFFFFF	3457381.0 Ops/sec
^ 0x000000000000	3506765.0 Ops/sec
Math.trunc()	2088087.0 Ops/sec
x - (x % 1)	2482572.0 Ops/sec
parseInt()	2078274.0 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)