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

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 136

Operating system: Android

Device Platform: Mobile

Date tested: 11 months ago

Test name	Executions per second
floor	503133.6 Ops/sec
~~	484145.4 Ops/sec
>> 0	533544.4 Ops/sec
\| 0	479065.0 Ops/sec
<< 0	521205.5 Ops/sec
Math.trunc()	509284.2 Ops/sec
x - (x % 1)	489291.5 Ops/sec
parseInt()	455874.1 Ops/sec
round()	466595.2 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);