Run results for: Shift loop vs unrolled

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.113 Safari/537.36

Browser: Chrome 53

Operating system: Mac OS X 10.10.5

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Shift loop	4066643.0 Ops/sec
Unrolled Loop	2036055.0 Ops/sec

Script Preparation code:

arr = [];
const ARRAY_SIZE = 5000;
for (let i = 0; i < ARRAY_SIZE; i++) {
  arr.push(i);
}

Tests:

Shift loop
while(arr.length) { let index = arr.shift(); index++; }
Unrolled Loop
const arrSize = arr.length; for (let i = 0; i < arrSize; i++) { let index = arr[i]; index++; } arr = [];