Run results for: Splice vs Spread vs Unshift vs Push to insert at beginning of array

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0

Browser: Firefox 102

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Script Preparation code:

var array = Array.from({ length: 2000 }).map((val, i) => i);

AخA
 
var array = Array.from({ length: 2000 }).map((val, i) => i);

Tests:

Splice
var newArray = array.splice(0, 0, 99);
var newArray = array.splice(0, 0, 99);
Spread
var newArray = [99, ...array];
var newArray = [99, ...array];
Unshift
var newArray = array.unshift(99);
var newArray = array.unshift(99);
Push
var newArray = array.push(99);
var newArray = array.push(99);