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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
floor	1250552704.0 Ops/sec
~~	1218158720.0 Ops/sec
>> 0	1037156224.0 Ops/sec
\| 0	1027821568.0 Ops/sec
<< 0	1035588160.0 Ops/sec
Math.trunc()	1371100416.0 Ops/sec
x - (x % 1)	1288333568.0 Ops/sec
parseInt()	1289248384.0 Ops/sec
round()	1280737664.0 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;
Math.trunc()
y = Math.trunc(x);
x - (x % 1)
y = x - (x % 1);
parseInt()
y = parseInt(x);
round()
y = Math.round(x);