Run results for: slice+push vs concat

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0

Browser: Firefox 81

Operating system: Windows 7

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
slice+push	19990434.0 Ops/sec
concat	12358650.0 Ops/sec

Tests:

slice+push
const testArray = [1, 2, 3]; const newTestArray = testArray.slice(); newTestArray.push(4);
concat
const testArray = [1, 2, 3]; const newTestArray = testArray.concat(4);