Run results for: Array Entries vs fori

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Safari/537.36

Browser: Chrome 91

Operating system: Mac OS X 10.12.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array.entries	6536.6 Ops/sec
Array for i	482.1 Ops/sec

Script Preparation code:

var as = [];
for (var i = 0; i < 10000; i++) {
  as.push(Math.floor(Math.random() * 1000));
}

Tests:

Array.entries
const res = []; for(const a of as.entries()) res.push(a);
Array for i
const res = []; for(let i = 0; i < as.length; i++) { const a = as[i]; res.push(a); }