Run results for: Lodash cloneDeep vs native cloneDeep

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0

Browser: Firefox 123

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Object.assign shallow clone

28.8M/s

Native map(shallow clone)

27.3M/s

Native map deep slice(turns objects into arrays)

12.8M/s

Native map deep slice at 0(turns objects into arrays)

11.3M/s

Recursive deep clone

1.9M/s

Map deep clone

1.8M/s

Native JSON parse

303K/s

Lodash cloneDeep

193K/s

View exact numbers

Test name	Executions per second
✓ Object.assign shallow clone	28,836,470 Ops/sec
Native map(shallow clone)	27,342,990 Ops/sec
Native map deep slice(turns objects into arrays)	12,783,508 Ops/sec
Native map deep slice at 0(turns objects into arrays)	11,307,115 Ops/sec
Recursive deep clone	1,913,072 Ops/sec
Map deep clone	1,843,099 Ops/sec
Native JSON parse	303,477 Ops/sec
Lodash cloneDeep	193,250 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;
};

Tests:

Lodash cloneDeep
testCopy = _.cloneDeep(testArray);
Native map deep slice(turns objects into arrays)
testCopy = testArray.map(arr => testArray.slice());
Native JSON parse
testCopy = JSON.parse(JSON.stringify(testArray));
Native map deep slice at 0(turns objects into arrays)
testCopy = testArray.map(arr => testArray.slice(0));
Native map(shallow clone)
testCopy = testArray.map(arr => arr);
Recursive deep clone
testCopy = deepClone(testArray);
Map deep clone
testCopy = testArray.map(arr => deepClone(arr));
Object.assign shallow clone
testCopy = Object.assign([...testArray]);