Benchmark: Lodash cloneDeep vs native cloneDeep vs structuredClone

Lodash cloneDeep vs native cloneDeep vs structuredClone (version: 0)

compare array copy/clone methods

Comparing performance of: Lodash cloneDeep vs Native map deep slice(turns objects into arrays) vs Native JSON parse vs Native map deep slice at 0(turns objects into arrays) vs Native map(shallow clone) vs Recursive deep clone vs Map deep clone vs Object.assign shallow clone vs structuredClone

Created: 3 years ago by: Guest

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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]);
structuredClone
testCopy = structuredClone(testArray);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
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
structuredClone

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Lodash cloneDeep	367175.7 Ops/sec
Native map deep slice(turns objects into arrays)	21010224.0 Ops/sec
Native JSON parse	665375.1 Ops/sec
Native map deep slice at 0(turns objects into arrays)	19335886.0 Ops/sec
Native map(shallow clone)	39734848.0 Ops/sec
Recursive deep clone	1656294.2 Ops/sec
Map deep clone	885428.1 Ops/sec
Object.assign shallow clone	36884556.0 Ops/sec
structuredClone	505623.1 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

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