Run results for: Lodash cloneDeep vs structuredClone vs Custom Implementation

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser: Firefox 144

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 9 months ago

Custom Deep Clone

1.5M/s

Lodash cloneDeep

628K/s

Native structuredClone

409K/s

View exact numbers

Test name	Executions per second
✓ Custom Deep Clone	1,530,387 Ops/sec
Lodash cloneDeep	628,460 Ops/sec
Native structuredClone	409,304 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var MyObject = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

function deepClone(x) {
  if (x === null || typeof x !== 'object') return x;
  if (Array.isArray(x)) return x.map((item) => deepClone(item));
  return Object.fromEntries(
    Object.entries(x).map(([key, value]) => [key, deepClone(value)])
  );
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Native structuredClone
myCopy = structuredClone(MyObject);
Custom Deep Clone
myCopy = deepClone(MyObject);

Run results for: Lodash cloneDeep vs structuredClone vs Custom Implementation

https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

Lodash cloneDeep

Native structuredClone

Custom Deep Clone