Run results for: Add item to array3

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Slice with spread	5719049.0 Ops/sec
Slice using concat	1615738.0 Ops/sec

Tests:

Slice with spread
const a = ["a", "b", "d", "e"]; const newItem = "c"; const index = 2; const b = [...a.slice(0, index), newItem, ...a.slice(index)];
Slice using concat
const a = ["a", "b", "d", "e"]; const newItem = "c"; const index = 2; const b = a.slice(0, index).concat(newItem, a.slice(index));
Splice
const a = ["a", "b", "d", "e"]; const newItem = "c"; const index = 2; const b = [...a]; b.splice(index, 0, newItem);