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

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)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
floor
~~
>> 0
\| 0
<< 0
& 0xFFFFFFFFFFFF
^ 0x000000000000
Math.trunc()
x - (x % 1)
parseInt()

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 5 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
floor	4905662.0 Ops/sec
~~	8346382.0 Ops/sec
>> 0	8360852.0 Ops/sec
\| 0	8340542.0 Ops/sec
<< 0	8356959.0 Ops/sec
& 0xFFFFFFFFFFFF	8339355.0 Ops/sec
^ 0x000000000000	8361745.0 Ops/sec
Math.trunc()	4999561.0 Ops/sec
x - (x % 1)	4355253.0 Ops/sec
parseInt()	4917729.0 Ops/sec