Run results for: Last item in array slice/0 vs length - 1 vs slice/pop vs slice/shift

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.3.1

Device Platform: Mobile

Date tested: 2 years ago

slice/0

25K/s

slice/pop

23K/s

slice/shift

19K/s

length - 1

18K/s

View exact numbers

Test name	Executions per second
✓ slice/0	24,891 Ops/sec
slice/pop	23,432 Ops/sec
slice/shift	19,028 Ops/sec
length - 1	17,543 Ops/sec

Script Preparation code:

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

Tests:

slice/0
for (let i = 0; i < 1000; i++) { const v = arr.slice(-1)[0]; }
length - 1
for (let i = 0; i < 1000; i++) { const v = arr[arr.length - 1]; }
slice/pop
for (let i = 0; i < 1000; i++) { const v = arr.slice(-1).pop(); }
slice/shift
for (let i = 0; i < 1000; i++) { const v = arr.slice(-1).shift(); }