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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

At ES2022 method -1 index

2K/s

Slice

2K/s

Length - 1

1K/s

View exact numbers

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); }