Run results for: math.sin vs fast sin vs cached math.sin

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/135.0.7049.53 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 135

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

fast sin

3.2M/s

Math.sin

1.9M/s

cachedSin

1.8M/s

View exact numbers

Test name	Executions per second
✓ fast sin	3,212,649 Ops/sec
Math.sin	1,897,074 Ops/sec
cachedSin	1,829,914 Ops/sec

Script Preparation code:

const PI = Math.PI;
const TAU = PI * 2;
const B = 4 / PI;
const C = -4 / TAU;
var cachedSin = Math.sin;
var sin = x =>  {
    return (B * x + C * x * ((x < 0) ? -x : x));
};

Tests:

Math.sin
let k = []; for (let i = 0; i < 100; ++i) k.push(Math.sin(i));
fast sin
let k = []; for (let i = 0; i < 100; ++i) k.push(sin(i));
cachedSin
let k = []; for (let i = 0; i < 100; ++i) k.push(cachedSin(i));