Benchmark: Lodash (4.17.11) cloneDeep vs JSON Clone

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/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;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Json clone
myCopy = JSON.parse(JSON.stringify(MyObject));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Json clone

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

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This benchmark compares two methods for creating a deep copy of a JavaScript object:

**Method 1:** Using `_.cloneDeep()` from the Lodash library.  Lodash is a popular library that provides utility functions for working with JavaScript objects and arrays. Its `cloneDeep()` function creates a fully independent copy of an object, including nested objects and arrays.

**Method 2:** Using `JSON.stringify()` and `JSON.parse()`. This approach converts the original object to a JSON string, then parses that string back into a new object. While simpler, it might not be as performant as specialized libraries like Lodash.

Here's a breakdown of their pros and cons:

**Lodash cloneDeep:**
* **Pros:** Highly efficient, designed specifically for deep cloning, handles complex object structures well.
* **Cons:** Requires including the Lodash library, potentially adding extra size to your project.

**JSON stringify/parse:** 
* **Pros:**  Built-in to JavaScript, no external dependencies needed.
* **Cons:** Can be slower than specialized libraries, might not handle all complex object types as gracefully, and can lose some data (like functions) during the JSON conversion process.

**Alternatives:**

Besides these two methods, there are other ways to create deep copies in JavaScript:

* **Manual Recursion:** You could write your own recursive function to iterate through an object and its nested properties, creating new copies for each level. This can be more complex but gives you fine-grained control.
* **Object Spread Syntax (`...`)**:  While not a true deep copy, the spread syntax (`...MyObject`) can create shallow copies of objects.

**Choosing the Right Approach:**

The best method depends on your specific needs:

* **Performance is crucial:** Use `_.cloneDeep()` from Lodash for optimal speed.
* **Simplicity and no dependencies:** Stick with `JSON.stringify()` and `JSON.parse()`, but be aware of potential performance limitations.

Related benchmarks:

Lodash (4.17.11) cloneDeep vs JSON Clone (version: 0)

Comparing performance of: Lodash cloneDeep vs Json clone

Created: 6 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Json clone

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):