Run results for: Lodash cloneDeep vs structuredClone vs simpleCloneDeep

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser: Chrome 141

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
Lodash cloneDeep	933623.8 Ops/sec
Native structuredClone	660066.2 Ops/sec
Simple cloneDeep	3861044.5 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...'
    },
    arr: [{
        test: 1
    }, {
        test: 2
    }, {
        test: {
            a: 1
        }
    }]
};

var myCopy = null;

function simpleCloneDeep(obj) {
  if (typeof obj !== 'object' || obj === null) {
    return obj;
  }

  let result;
  if (
    (typeof obj.length === 'number' && obj instanceof Array) ||
    // fix: instanceof Array 在IDE模拟器的iframe环境中判断为 false
    Object.prototype.toString.call(obj) === '[object Array]'
  ) {
    const { length } = obj;
    result = new Array(length);
    for (let i = 0; i < length; i += 1) {
      result[i] = simpleCloneDeep(obj[i]);
    }

    return result;
  }

  // ios10 上，proxy 对象 Object.prototype.toString.call(obj)返回 '[object,ProxyObject]'
  switch (Object.prototype.toString.call(obj)) {
    case '[object Map]':
      result = new Map();
      obj.forEach((subValue, key) => {
        result.set(key, simpleCloneDeep(subValue));
      });
      return result;
    case '[object Set]':
      result = new Set();
      obj.forEach((subValue) => {
        result.add(simpleCloneDeep(subValue));
      });
      return result;

    default:
      result = {};
      for (const i in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, i)) {
          result[i] = simpleCloneDeep(obj[i]);
        }
      }

      return result;
  }
}

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Native structuredClone
myCopy = structuredClone(MyObject);
Simple cloneDeep
myCopy = simpleCloneDeep(MyObject);

Run results for: Lodash cloneDeep vs structuredClone vs simpleCloneDeep

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

Lodash cloneDeep

Native structuredClone

Simple cloneDeep