Run results for: Lodash cloneDeep vs native cloneDeep

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:88.0) Gecko/20100101 Firefox/88.0

Browser: Firefox 88

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Lodash cloneDeep	100572.2 Ops/sec
Native map deep slice(turns objects into arrays)	7797199.0 Ops/sec
Native JSON parse	217065.2 Ops/sec
Native map deep slice at 0(turns objects into arrays)	8003251.0 Ops/sec
Native map(shallow clone)	18111902.0 Ops/sec
Recursive deep clone	454746.7 Ops/sec
Map deep clone	454057.6 Ops/sec
Object.assign shallow clone	8673165.0 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]);

Run results for: Lodash cloneDeep vs native cloneDeep

compare array copy/clone methods

Lodash cloneDeep

Native map deep slice(turns objects into arrays)

Native JSON parse

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

Native map(shallow clone)

Recursive deep clone

Map deep clone

Object.assign shallow clone