Run results for: Splice vs Spread vs Unshift to insert at beginning of array (fixed from slice)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 YaBrowser/20.11.3.268 (beta) Yowser/2.5 Safari/537.36

Browser: Yandex Browser 20

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Splice	3597.5 Ops/sec
Spread	135.3 Ops/sec
Unshift	9381.0 Ops/sec

Script Preparation code:

var array = Array.from({ length: 100 }).map((val, i) => i);

Tests:

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