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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Splice	11036329.0 Ops/sec
Spread	1864112.6 Ops/sec

Script Preparation code:

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

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

Tests:

Splice
var newArray = array.slice(0, 0, 99);
var newArray = array.slice(0, 0, 99);
Spread
var newArray = [99, ...array];
var newArray = [99, ...array];