Run results for: Last item in array Slice vs Length - 1 vs At -1

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; M2102J20SG) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.5481.192 Mobile Safari/537.36 OPR/74.1.3922.71199

Browser: Opera Mobile 74

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Slice	756.9 Ops/sec
Length - 1	509.9 Ops/sec
At ES2022 method -1 index	1061.1 Ops/sec

Script Preparation code:

var arr = [];
for (let i = 0; i < 1000000; i++) {
  arr.push(i);
}

Tests:

Slice
for (let i = 0; i < 10000; i++) { const v = arr.slice(-1)[0]; }
Length - 1
for (let i = 0; i < 10000; i++) { const v = arr[arr.length - 1]; }
At ES2022 method -1 index
for (let i = 0; i < 10000; i++) { const v = arr.at(-1); }

Run results for: Last item in array Slice vs Length - 1 vs At -1

Slice

Length - 1

At ES2022 method -1 index