Benchmark: lodash clonedeep vs json.parse(stringify()) vs recursivecopy

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var MyObject = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var myCopy = null;

function recursiveDeepCopy(o) {
    var newO,
      i;
  
    if (typeof o !== 'object') {
      return o;
    }
    if (!o) {
      return o;
    }
  
    if ('[object Array]' === Object.prototype.toString.apply(o)) {
      newO = [];
      for (i = 0; i < o.length; i += 1) {
        newO[i] = recursiveDeepCopy(o[i]);
      }
      return newO;
    }
  
    newO = {};
    for (i in o) {
      if (o.hasOwnProperty(i)) {
        newO[i] = recursiveDeepCopy(o[i]);
      }
    }
    return newO;
  }

Tests:

Lodash CloneDeep
myCopy = _.cloneDeep(MyObject);
Json Clone
myCopy = JSON.parse(JSON.stringify(MyObject));
recursiveDeepCopy
myCopy = recursiveDeepCopy(MyObject);

Historical Performance Data aggregated from 542 community runs

Desktop Results:

Chrome 437 runs

recursiveDeepCopy

1.9M/s

Lodash CloneDeep

1.2M/s

Json Clone

975K/s

Fastest: recursiveDeepCopy (2.0x faster)

View exact numbers

✓ recursiveDeepCopy: 1,943,763 ops/sec
• Lodash CloneDeep: 1,218,288 ops/sec
• Json Clone: 975,236 ops/sec

Firefox 50 runs

recursiveDeepCopy

5.9M/s

Lodash CloneDeep

1.0M/s

Json Clone

741K/s

Fastest: recursiveDeepCopy (7.9x faster)

View exact numbers

✓ recursiveDeepCopy: 5,863,579 ops/sec
• Lodash CloneDeep: 1,043,030 ops/sec
• Json Clone: 740,860 ops/sec

Safari 18 runs

Lodash CloneDeep

2.2M/s

recursiveDeepCopy

2.2M/s

Json Clone

1.5M/s

Fastest: Lodash CloneDeep (1.5x faster)

View exact numbers

✓ Lodash CloneDeep: 2,226,530 ops/sec
• recursiveDeepCopy: 2,223,775 ops/sec
• Json Clone: 1,477,701 ops/sec

Other 11 runs

recursiveDeepCopy

1.9M/s

Lodash CloneDeep

1.5M/s

Json Clone

1.0M/s

Fastest: recursiveDeepCopy (1.9x faster)

View exact numbers

✓ recursiveDeepCopy: 1,869,437 ops/sec
• Lodash CloneDeep: 1,517,582 ops/sec
• Json Clone: 1,004,874 ops/sec

Mobile Results:

Safari 13 runs

Lodash CloneDeep

2.3M/s

recursiveDeepCopy

1.9M/s

Json Clone

1.3M/s

Fastest: Lodash CloneDeep (1.8x faster)

View exact numbers

✓ Lodash CloneDeep: 2,289,775 ops/sec
• recursiveDeepCopy: 1,941,312 ops/sec
• Json Clone: 1,278,885 ops/sec

Chrome 13 runs

recursiveDeepCopy

1.1M/s

Lodash CloneDeep

693K/s

Json Clone

623K/s

Fastest: recursiveDeepCopy (1.8x faster)

View exact numbers

✓ recursiveDeepCopy: 1,117,179 ops/sec
• Lodash CloneDeep: 692,535 ops/sec
• Json Clone: 622,657 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash CloneDeep
Json Clone
recursiveDeepCopy

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Mac OS X 10.15.7

View result in a separate tab

recursiveDeepCopy

8.5M/s

Lodash CloneDeep

2.8M/s

Json Clone

2.6M/s

View exact numbers

Test name	Executions per second
✓ recursiveDeepCopy	8,525,141 Ops/sec
Lodash CloneDeep	2,827,493 Ops/sec
Json Clone	2,612,264 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what is being tested.

The provided JSON represents a JavaScript microbenchmark that compares three approaches for creating a deep copy of an object: `lodash.cloneDeep`, `JSON.parse(JSON.stringify())`, and a custom recursive function called `recursiveDeepCopy`.

**Test Case 1: Lodash CloneDeep**

* **Library:** Lodash is a popular JavaScript utility library developed by Isaac Schlueter. It provides a wide range of functions for common tasks, such as array manipulation, string manipulation, and object creation.
* **Functionality:** The `cloneDeep` function creates a deep copy of an object, which means it recursively copies all properties and nested objects.
* **Pros:**
	+ Fast and efficient
	+ Handles complex objects with ease
	+ Part of the popular Lodash library
* **Cons:**
	+ Additional dependency on the Lodash library
	+ May not be suitable for projects where size is a concern

**Test Case 2: JSON.parse(JSON.stringify())**

* **Functionality:** This approach uses the `JSON.parse()` function to parse a JSON string, which creates a deep copy of an object. The `JSON.stringify()` function is used to convert an object to a JSON string.
* **Pros:**
	+ Lightweight and small
	+ No additional dependencies required
	+ Easy to implement
* **Cons:**
	+ May not handle certain data types or objects correctly (e.g., functions, undefined values)
	+ Can be slow for large objects

**Test Case 3: recursiveDeepCopy**

* **Functionality:** This is a custom function that recursively creates a deep copy of an object. It handles arrays and objects with nested properties.
* **Pros:**
	+ Customizable to handle specific use cases
	+ No additional dependencies required
	+ Fast and efficient
* **Cons:**
	+ Requires manual implementation and testing
	+ May not be suitable for projects where code readability is a concern

Other alternatives to consider:

1. **Object.assign()**: This method creates a shallow copy of an object, which means it only copies the top-level properties.
2. **Array.prototype.slice()**: This method creates a shallow copy of an array by returning a new array with references to the original elements.
3. **for...in loops** or **JSON.parse()` with **JSON.parse(JSON.stringify())** for more complex object structures.

Keep in mind that each approach has its trade-offs, and the best choice depends on your specific use case, performance requirements, and code readability concerns.

lodash clonedeep vs json.parse(stringify()) vs recursivecopy (version: 0)

Comparing performance of: `Lodash CloneDeep vs Json Clone vs recursiveDeepCopy`

Created: 7 years ago by: Guest

Go to the latest result

Lodash CloneDeep

Json Clone

recursiveDeepCopy

Historical Performance Data aggregated from 542 community runs

Desktop Results:

Chrome 437 runs

Firefox 50 runs

Safari 18 runs

Other 11 runs

Mobile Results:

Safari 13 runs

Chrome 13 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

lodash clonedeep vs json.parse(stringify()) vs recursivecopy (version: 0)

Comparing performance of: Lodash CloneDeep vs Json Clone vs recursiveDeepCopy

Created: 7 years ago by: Guest

Go to the latest result

Lodash CloneDeep

Json Clone

recursiveDeepCopy

Historical Performance Data aggregated from 542 community runs

Desktop Results:

Chrome 437 runs

Firefox 50 runs

Safari 18 runs

Other 11 runs

Mobile Results:

Safari 13 runs

Chrome 13 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Lodash CloneDeep vs Json Clone vs recursiveDeepCopy`