Run results for: reduce.concat() vs flat() vs spread2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.85 YaBrowser/21.11.0.2054 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 21

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
reduce + spread	9892595.0 Ops/sec
Array.prototype.flat	806260.9 Ops/sec
reduce + concat	5443106.0 Ops/sec

Tests:

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

Run results for: reduce.concat() vs flat() vs spread2

Compare the new ES6 spread operator with the traditional concat() method

reduce + spread

Array.prototype.flat

reduce + concat