Run results for: Lodash cloneDeep vs native cloneDeep vs dom cloneDeep

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

Browser: Chrome 90

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Lodash cloneDeep	196356.2 Ops/sec
Recursive deep clone	149273.2 Ops/sec
Dom deep clone	232082.5 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 testArray = [{
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  },
  testArray: [{
    myName: 'test name',
    myNumber: 123245
  }]
},{
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  },
  testArray: [{
    myName: 'test name',
    myNumber: 123245
  }]
}];

var testCopy = null;

var deepClone = function(obj) {
   var out;
    if (Array.isArray(obj)) {
        out = [];
        for (var index = 0; index < obj.length; ++index) {
            let subArray = obj[index];
            out.push((subArray === null) ? subArray : (subArray instanceof Date) ? new Date(subArray.valueOf()) : (typeof subArray === 'object') ? deepClone(subArray) : subArray);
        }
    } else {
        out = {};
        for (var key in obj) {
            var subObject = obj[key];
            out[key] = subObject === null ? subObject : subObject instanceof Date ? new Date(subObject.valueOf()) : (typeof subObject === 'object') ? deepClone(subObject) : subObject;
            
           
        }
    }
    return out;
};


var cloneDeep2 = (data) => {
  
  if (typeof data === 'object' && data != null) {
    
    const clonedObj = Array.isArray(data) ? [] : {};

    for(let key in data) {
      if (typeof data[key] === 'object')
      {
        clonedObj[key] = cloneDeep2(data[key]);
      }
    }
    return clonedObj;
  }
  return data;
}

Tests:

Lodash cloneDeep
testCopy = _.cloneDeep(testArray);
Recursive deep clone
testCopy = deepClone(testArray);
Dom deep clone
testCopy = cloneDeep2(testArray);

Run results for: Lodash cloneDeep vs native cloneDeep vs dom cloneDeep

compare array copy/clone methods

Lodash cloneDeep

Recursive deep clone

Dom deep clone