Benchmark: Lodash cloneDeep vs native cloneDeep (copy object5)

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 testObject = {
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  }
};
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 clone = function(obj) {
  	let temp;
    if (obj === null || typeof (obj) !== 'object' || 'isActiveClone' in obj) {
        return obj;
    }

    if (obj instanceof Date) {
        let temp = new obj.constructor(); 
    }
    else {
        let temp = obj.constructor();
    }

    for (let key in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, key)) {
            obj['isActiveClone'] = null;
            temp[key] = clone(obj[key]);
            delete obj['isActiveClone'];
        }
    }
    return temp;
}

var cloneWithKeys = function(obj) {
  	let temp;
    if (obj === null || typeof (obj) !== 'object' || 'isActiveClone' in obj) {
        return obj;
    }

    if (obj instanceof Date) {
        let temp = new obj.constructor(); 
    }
    else {
        let temp = obj.constructor();
    }

    Object.keys(obj).forEach(key => {
        //if (Object.prototype.hasOwnProperty.call(obj, key)) {
            obj['isActiveClone'] = null;
            temp[key] = clone(obj[key]);
            delete obj['isActiveClone'];
        //}
    })
    return temp;
}

Tests:

Lodash cloneDeep
testCopy = _.cloneDeep(testObject);
Deep Clone test
testCopy = deepClone(testObject)
Alt Clone
testCopy = clone(testObject)
Alt Clone Keys
testCopy = cloneWithKeys(testObject)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Deep Clone test
Alt Clone
Alt Clone Keys

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

I'd be happy to help explain what's being tested in this benchmark.

**Benchmark Overview**

This benchmark compares the performance of four different methods for cloning objects:

1. `deepClone` (a custom implementation)
2. `cloneWithKeys` (another custom implementation)
3. `clone` (a built-in method from Node.js, using `isActiveClone`)
4. `_.cloneDeep` (from Lodash library)

The benchmark creates a test object with nested properties and arrays, and then clones this object using each of the four methods.

**What's being tested**

Here are the specific things that are being tested:

* How fast each method is for cloning objects.
* Which method produces the most accurate clone (i.e., preserves all properties and values).

**Options Comparison**

Let's break down each option:

1. `deepClone`:
	* Pros: Custom implementation allows for fine-grained control over cloning logic.
	* Cons: Requires implementing a deep cloning algorithm from scratch, which can be error-prone and slow.
2. `cloneWithKeys`:
	* Pros: Similar to `deepClone`, but with an additional layer of abstraction that makes the code slightly more efficient.
	* Cons: Still requires custom implementation, and its performance may not be optimal.
3. `clone` (Node.js built-in method):
	* Pros: Fast and simple to implement, as it's a built-in method from Node.js.
	* Cons: May not produce accurate clones due to the use of `isActiveClone`, which can lead to lost data or incorrect behavior in certain cases.
4. `_.cloneDeep` (Lodash library):
	* Pros: Well-tested and widely adopted implementation that produces accurate clones.
	* Cons: Requires including an external library, which may add overhead.

**Other Considerations**

When choosing a cloning method, you should also consider the following factors:

* **Data loss**: How much data do you need to preserve from the original object? Some methods (like `clone`) may lose certain properties or values.
* **Performance overhead**: How critical is speed when creating clones? Some methods (like `deepClone` and `cloneWithKeys`) may be slower due to their complexity.
* **Development ease**: How important is it for you to implement a cloning method from scratch? If not, using an external library like Lodash can save time.

**Benchmark Results**

The latest benchmark results show that:

* `_.cloneDeep` (Lodash) produces the fastest and most accurate clones, with an average execution speed of around 760,000 executions per second.
* `deepClone` and `cloneWithKeys` are close in performance, but may be slower due to their custom implementation.
* The `clone` method from Node.js performs poorly, likely due to its use of `isActiveClone`, which leads to lost data or incorrect behavior.

In summary, when choosing a cloning method, consider your priorities: speed, accuracy, and development ease. If you need high performance and accuracy, using an external library like Lodash may be the best choice.

Related benchmarks:

Lodash cloneDeep vs native cloneDeep (copy object5) (version: 2)

compare array copy/clone methods

Comparing performance of: Lodash cloneDeep vs Deep Clone test vs Alt Clone vs Alt Clone Keys

Created: 3 years ago by: Registered User

Jump to the latest result

Lodash cloneDeep

Deep Clone test

Alt Clone

Alt Clone Keys

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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