Run results for: 2 getItems(): flatMap() vs map() and flat()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:150.0) Gecko/20100101 Firefox/150.0

Browser: Firefox 150

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
map().flat()	4265.1 Ops/sec
flatMap()	54338.3 Ops/sec

Script Preparation code:

var arr = new Set();
var i = 0;

while (i <= 500) arr.add({
    num: [1, i++]
});

Tests: