Run results for: Slice vs Splice insert element to array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

insert by using splice

65K/s

insert by join multi sub-array

4K/s

View exact numbers

Test name	Executions per second
✓ insert by using splice	64,542 Ops/sec
insert by join multi sub-array	4,034 Ops/sec

Script Preparation code:

var array = []
for (let i = 0; i < 100000; i++) {array.push(i)}
var indexToRemove = 6700
var indexToInsert = 4200

Tests:

insert by join multi sub-array
array = array.slice(0,indexToInsert).concat('meo', array.slice(indexToInsert, indexToRemove), array.slice(indexToRemove+1, array.length))
insert by using splice
array.splice(indexToRemove, 1) array.splice(indexToInsert, 0, 'meo')