Run results for: lodash flatten vs reduce array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

flatten

40K/s

reduce

3K/s

View exact numbers

Test name	Executions per second
✓ flatten	40,483 Ops/sec
reduce	3,431 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Script Preparation code:

myList = [];

for (let i = 0; i < 100; i++) {
  const arr = [];
  for (var n = 0; n < 100; n++) {
    arr.push({ ['key' + n]: n });
  }
  myList.push(arr)
}

Tests:

flatten
_.flatten(myList)
reduce
myList.reduce((acc, item) => { return [...acc, ...item]; }, [])