Run results for: Lodash cloneDeep vs structuredClone vs Custom Implementation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Lodash cloneDeep

1.5M/s

Custom Deep Clone

1.2M/s

Native structuredClone

1.0M/s

View exact numbers

Test name	Executions per second
✓ Lodash cloneDeep	1,472,578 Ops/sec
Custom Deep Clone	1,188,764 Ops/sec
Native structuredClone	1,004,916 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