Run results for: array vs Float64Array with floats (small array)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Float64Array reverse

2.3M/s

normal array reverse

734K/s

normal array i/o

20K/s

Swap between arrays

15K/s

Float64Array i/o

15K/s

View exact numbers

Script Preparation code:

var a = [...Array(500)].map(_ => Math.random());
var ta = (new Float64Array(500)).map(_ => Math.random());

Tests:

normal array reverse
a.reverse().reverse().reverse();
Float64Array reverse
ta.reverse().reverse().reverse();
normal array i/o
for (let i=1; i !== 10000; i=i+1|0) { a[i] = a[i] + 1.1 - a[i-1|0]; }
Float64Array i/o
for (let i=1; i !== 10000; i=i+1|0) { ta[i] = ta[i] + 1.1 - ta[i-1|0]; }
Swap between arrays
for (let i=0; i !== 10000; i=i+1|0) { var tmp = ta[i]; ta[i] = a[i]; a[i] = tmp; }