Run results for: reduce.concat() vs flat() vs concat()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36

Browser: Chrome 90

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
reduce + Array.prototype.concat	2015152.1 Ops/sec
Array.prototype.flat	434189.0 Ops/sec
concat using decomposition	3220487.2 Ops/sec

Tests:

reduce + Array.prototype.concat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => acc.concat(val), []);
Array.prototype.flat
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat();
concat using decomposition
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = [].concat(...params);