Run results for: JSON.parse(JSON.stringify()) vs. cloneDeep vs. custom clone

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

myCopy = ObjectUtils.clone(MyObject);

4.0M/s

myCopy = _.cloneDeep(MyObject);

1.7M/s

myCopy = JSON.parse(JSON.stringify(MyObject));

1.4M/s

View exact numbers

Test name	Executions per second
✓ myCopy = ObjectUtils.clone(MyObject);	4,035,111 Ops/sec
myCopy = _.cloneDeep(MyObject);	1,748,214 Ops/sec
myCopy = JSON.parse(JSON.stringify(MyObject));	1,449,984 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

const 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...'
  }
};

let myCopy = null;

///////////////////////////////////////////////////////////////////
class ObjectUtils {
  static clone(obj) {
    let clone

    if (typeof obj !== 'object') {
      return obj
    }
    if (!obj) {
      return obj
    }
    if (Array.isArray(obj)) {
      clone = []
      for (let i = 0; i < obj.length; i += 1) {
        clone[i] = ObjectUtils.clone(obj[i])
      }
      return clone
    }

    clone = {}
    Object.keys(obj).forEach((key) => {
      if (Object.prototype.hasOwnProperty.call(obj, key)) {
        clone[key] = ObjectUtils.clone(obj[key])
      }
    })

    return clone
  }
}

Tests:

myCopy = JSON.parse(JSON.stringify(MyObject));
myCopy = JSON.parse(JSON.stringify(MyObject));
myCopy = _.cloneDeep(MyObject);
myCopy = _.cloneDeep(MyObject);
myCopy = ObjectUtils.clone(MyObject);
myCopy = ObjectUtils.clone(MyObject);