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: 15 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Test name	Executions per second
floor	7472093.0 Ops/sec
~~	13009970.0 Ops/sec
>> 0	13047850.0 Ops/sec
\| 0	12975320.0 Ops/sec
<< 0	12957360.0 Ops/sec
& 0xFFFFFFFFFFFF	12703680.0 Ops/sec
^ 0x000000000000	13034480.0 Ops/sec
Math.trunc()	7259133.0 Ops/sec
x - (x % 1)	8146400.0 Ops/sec
parseInt()	7544253.0 Ops/sec