Run results for: for/for len

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/8.0.25(0x1800192b) NetType/WIFI Language/zh_CN

Browser: Mobile Safari 15

Operating system: iOS 15.6

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
for len	2973.2 Ops/sec
for	1440.7 Ops/sec

Script Preparation code:

var array = new Array(10000);
for (let i = 0; i < array.length; i++) {
  array[i] = i;
}

Tests:

for len
let sum = 0; for (let i = 0, len = array.length; i < len; i++) { sum += array[i]; }
for
let sum = 0; for (let i = 0; i < array.length; i++) { sum += array[i]; }