Run results for: Array.flat() vs. concat() + spreadOperator

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4780.0 Safari/537.36

Browser: Chrome 99

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
concat() + spread operator	5222661.0 Ops/sec
Array.flat()	722862.3 Ops/sec

Tests:

concat() + spread operator
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = [].concat(...params);
Array.flat()
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat();