Run results for: array spread vs splice.apply

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser: Chrome 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
array spread	1434737.0 Ops/sec
splice.apply	1167.3 Ops/sec

Script Preparation code:

var arr1 = new Array(10);
var arr2 = new Array(10);
var arr3 = new Array(10);
var arr4 = new Array(10);
var arr5 = new Array(10);
var arr6 = new Array(10);
var arr7 = new Array(10);
var arr8 = new Array(10);
arr1.fill(1);
arr2.fill(2);
arr3.fill(1);
arr4.fill(2);
arr5.fill(1);
arr6.fill(2);
arr7.fill(1);
arr8.fill(2);

Tests:

array spread
var result = [...arr1, ...arr2]
splice.apply
Array.prototype.splice.apply(arr3, [arr4.length, 0].concat(arr4))