Benchmark: cloneDeep vs Clone

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;

Tests:

Lodash cloneDeep
myCopy = _.clone(MyObject);
es6 clone
myCopy = {...MyObject};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
es6 clone

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is testing two approaches to create a deep copy of an object: `_.clone` from Lodash (a popular utility library for JavaScript) and the spread operator (`{...}`) in ECMAScript 6 (ES6).

**Options Compared**

* **Lodash cloneDeep**: This method uses Lodash's `cloneDeep` function, which creates a deep copy of an object by recursively cloning all its properties. The implementation is often optimized for performance.
* **es6 clone**: This approach uses the spread operator (`{...}`) to create a shallow copy of an object. When used with objects that contain only primitive values (e.g., numbers, booleans), this approach creates a deep copy by default.

**Pros and Cons**

* **Lodash cloneDeep**:
	+ Pros: Can handle complex object structures, including nested arrays and objects.
	+ Cons: Requires the presence of Lodash in the execution environment. May have performance overhead due to the library's overhead.
* **es6 clone**:
	+ Pros: Lightweight, doesn't require any additional libraries.
	+ Cons: Only creates a shallow copy for simple values (e.g., numbers, booleans). Can create unexpected behavior when used with objects containing complex structures.

**Library and Purpose**

The `cloneDeep` function from Lodash is designed to provide a reliable way to create deep copies of objects. It recursively traverses the object's properties, cloning each one as needed. This ensures that all nested objects and arrays are copied correctly.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark. The use of Lodash's `cloneDeep` function is specific to the library itself.

**Other Considerations**

When creating deep copies, it's essential to consider the following:

* If you're working with large objects or complex data structures, using a library like Lodash can help ensure accurate and efficient copying.
* When using the spread operator (`{...}`) to create shallow copies, be aware that this approach may not work as expected when dealing with nested objects or arrays.

**Alternatives**

If you don't want to use Lodash or rely on the spread operator for object creation, consider the following alternatives:

* Using `Object.assign()` to create a shallow copy.
* Implementing your own recursive copying function using a loop or recursion.
* Utilizing other libraries, such as `immer` or `deep-copy`, which provide similar functionality.

Related benchmarks:

cloneDeep vs Clone (version: 1)

Comparing performance of: Lodash cloneDeep vs es6 clone

Created: 7 years ago by: Registered User

Jump to the latest result

Lodash cloneDeep

es6 clone

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):