Run results for: Lodash cloneDeep vs structuredClone vs JSON Parse vs fastDeepClone

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36 Edg/142.0.0.0

Browser: Chrome 142

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

custom fastCloneDeep

1.2M/s

Native structuredClone

313K/s

Lodash cloneDeep

285K/s

JSON Parse

271K/s

View exact numbers

Test name	Executions per second
✓ custom fastCloneDeep	1,239,927 Ops/sec
Native structuredClone	312,758 Ops/sec
Lodash cloneDeep	284,834 Ops/sec
JSON Parse	270,660 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...'
  },
  deeper: {
    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...'
    },
    deeper: {
      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...'
      },
      wayWayDown: {
        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...'
        },
        date: new Date(),
        set: new Set([1,2,3,4,5]),
        map: new Map([['a','b'],['c','d']])
      }
    }
  }
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Native structuredClone
myCopy = structuredClone(MyObject);
JSON Parse
myCopy = JSON.parse(JSON.stringify(MyObject));
custom fastCloneDeep
function fastCloneDeep(value) { if (value === null || typeof value !== 'object') return value; if (Array.isArray(value)) return value.map(fastCloneDeep); if (value instanceof Date) return new Date(value.getTime()); const cloned = {}; for (const key in value) { if (Object.prototype.hasOwnProperty.call(value, key)) { cloned[key] = fastCloneDeep(value[key]); } } return cloned; } myCopy = fastCloneDeep(MyObject);

Run results for: Lodash cloneDeep vs structuredClone vs JSON Parse vs fastDeepClone

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

Lodash cloneDeep

Native structuredClone

JSON Parse

custom fastCloneDeep