Run results for: slice VS splice VS shift: who is the fastest to split array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0

Browser: Firefox 128

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

splice

8.1M/s

slice

7.3M/s

View exact numbers

Test name	Executions per second
✓ splice	8,054,742 Ops/sec
slice	7,310,662 Ops/sec

Script Preparation code:

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

Tests:

slice
list.push('slice'); let list2 = []; while (list.length) { list2.push(list.slice(1, 50)); list.splice(0, 50); }
splice
list.push('splice'); let list2 = []; while (list.length) { list2.push(list.splice(0, 50)); }