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; rv:52.0) Gecko/20100101 Firefox/52.0

Browser: Firefox 52

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
floor	93395240.0 Ops/sec
~~	139476880.0 Ops/sec
>> 0	139539440.0 Ops/sec
\| 0	140038064.0 Ops/sec
<< 0	140647344.0 Ops/sec
& 0xFFFFFFFFFFFF	136545568.0 Ops/sec
^ 0x000000000000	139595968.0 Ops/sec
Math.trunc()	27469622.0 Ops/sec
x - (x % 1)	22026382.0 Ops/sec
parseInt()	30878052.0 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;
& 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)

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