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

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; Pixel 4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Mobile Safari/537.36

Browser: Chrome Mobile 91

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
reduce + Array.prototype.concat	2383761.8 Ops/sec
Array.prototype.flat	577570.8 Ops/sec
concat using decomposition	3815214.0 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);