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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Mac OS X 10.10.3

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Table lookup	10630922.0 Ops/sec
Math.pow	5292045.0 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);