Run results for: Math.pow(2,n) vs Table lookup?

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 139

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Math.pow

80.9M/s

Table lookup

75.2M/s

View exact numbers

Test name	Executions per second
✓ Math.pow	80,905,760 Ops/sec
Table lookup	75,216,416 Ops/sec

Script Preparation code:

var POWERS = [
		1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,
		65536,131072,262144,524288,1048576,2097152
		
];

Tests:

Table lookup
let p = 15; let x; if (p > 20) { x = Math.pow(2,p); } else { x = POWERS[20]; }
Math.pow
let p = 15; let x; x = Math.pow(2,p);