Run results for: index array vs cache indexed value

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

cached indexed value

15K/s

index each iteration

8K/s

View exact numbers

Test name	Executions per second
✓ cached indexed value	14,675 Ops/sec
index each iteration	7,607 Ops/sec

Script Preparation code:

var arr = [];
for(let i = 0; i < 10000; i++) {
  arr.push(Math.random());
}
var arrLength = arr.length;

Tests:

cached indexed value
let sum = 0; for(let i = 0; i < arrLength; i++) { const el = arr[i]; sum += el; sum += el; sum += el; sum += el; sum += el; }
index each iteration
let sum = 0; for(let i = 0; i < arrLength; i++) { sum += arr[i]; sum += arr[i]; sum += arr[i]; sum += arr[i]; sum += arr[i]; }