Run results for: Fast atan2 vs Math.atan2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.4972.0 Safari/537.36

Browser: Chrome 102

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
atan2	6046074.5 Ops/sec
fast atan2	5949697.5 Ops/sec

Script Preparation code:

const abs = Math.abs, min = Math.min, max = Math.max, PI = Math.PI, PI2 = PI / 2;
    var fatan2 = (y, x) => {
         const ax = abs(x);
         const ay = abs(y);
         const a = min(ax, ay) / max(x, y);
         const s = a * a;
         let r = ((-0.0464964749 * s + 0.15931422) * s - 0.327622764) * s * a + a;
         if (ay > ax) r = PI2 - r;
         if (x < 0) r = PI - r;
         if (y < 0) r = -r;
         return r;
    };
    var atan2 = Math.atan2;
var random = Math.random;

Tests:

atan2
var k = atan2(random());
fast atan2
var k = fatan2(random());

Run results for: Fast atan2 vs Math.atan2

atan2

fast atan2