Benchmark: lodash flattenDeep vs js native

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.js"></script>

Script Preparation code:

var elements = [1, [2, [3, [4]], 5]];

const flattenDeep = (arr) => Array.isArray(arr)
  ? arr.reduce( (a, b) => a.concat(flattenDeep(b)) , [])
  : [arr];

const flattenDeepL = (arr) => arr.flatMap((subArray, index) => Array.isArray(subArray) ? flattenDeepL(subArray) : subArray);

Tests:

_.flattenDeep
_.flattenDeep(elements);
// Native
const flattenDeep = (arr) => Array.isArray(arr) ? arr.reduce( (a, b) => a.concat(flattenDeep(b)) , []) : [arr]; flattenDeep(elements)
Native(ES2019)
elements.flat(Infinity)
native 2
const flattenDeep = (arr) => arr.flatMap((subArray, index) => Array.isArray(subArray) ? flattenDeep(subArray) : subArray) flattenDeep(elements)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.flattenDeep
// Native
Native(ES2019)
native 2

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 14 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.flattenDeep	6729920.0 Ops/sec
// Native	1141160.0 Ops/sec
Native(ES2019)	5801457.0 Ops/sec
native 2	1288798.0 Ops/sec

lodash flattenDeep vs js native (version: 0)

Comparing performance of: _.flattenDeep vs // Native vs Native(ES2019) vs native 2

Created: 3 years ago by: Guest

Jump to the latest result

_.flattenDeep

// Native

Native(ES2019)

native 2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A