Run results for: slice VS splice VS shift: who is the fastest to keep constant size

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; ) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.61 Chrome/126.0.6478.61 Not/A)Brand/8 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

splice

14K/s

shift

9K/s

slice

908/s

View exact numbers

Test name	Executions per second
✓ splice	14,142 Ops/sec
shift	8,537 Ops/sec
slice	908 Ops/sec

Script Preparation code:

var list = [];
for (var i = 0; i < 1000 * 1000; i++) {
  list.push(i);
}

Tests:

slice
list.push('slice'); list = list.slice(1);
splice
list.push('splice'); list.splice(0, 1);
shift
list.push('splice'); list.shift();

Run results for: slice VS splice VS shift: who is the fastest to keep constant size

100k list splice and shift win, they mutate list slice loose, it creates a copy of list 7.5x slower

slice

splice

shift