Benchmark: Lodash cloneDeep vs structuredClone vs JSON.stringify (small object)

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 = {color: "#BDBDBD", x: 506, y: 230.75};

var myCopy = null;

Tests:

lodash
myCopy = _.cloneDeep(MyObject);
structedClone (native)
myCopy = structuredClone(MyObject);
JSON.parse
myCopy = JSON.parse(JSON.stringify(MyObject));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
structedClone (native)
JSON.parse

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Browser/OS: Chrome 145 on Linux

View result in a separate tab

Test name	Executions per second
lodash	1950015.4 Ops/sec
structedClone (native)	610000.0 Ops/sec
JSON.parse	2313394.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview**

The provided benchmark measures the performance of three methods for creating a copy of an object in JavaScript: Lodash's `cloneDeep`, Mozilla's `structuredClone` (a native implementation), and `JSON.parse(JSON.stringify(obj))`. The goal is to determine which method is the fastest.

**Methods Compared**

1. **Lodash's `cloneDeep`**: This method uses a recursive approach to create a deep copy of an object, which means it also copies nested objects.
2. **Mozilla's `structuredClone` (native)**: This is a native implementation in JavaScript, introduced in ECMAScript 2022, that creates a shallow copy of an object by creating a new instance with the same value types and property names as the original object.
3. **`JSON.parse(JSON.stringify(obj))`**: This method uses JSON serialization to create a copy of an object. It serializes the object to a string using `JSON.stringify`, then deserializes it back into an object using `JSON.parse`.

**Pros and Cons**

* **Lodash's `cloneDeep`**:
	+ Pros: Recursively creates deep copies, handles complex objects with nested objects.
	+ Cons: Can be slower due to the recursive approach and potential overhead of cloning entire objects.
* **Mozilla's `structuredClone` (native)**:
	+ Pros: Fast, efficient, and optimized for modern JavaScript environments.
	+ Cons: Only creates shallow copies, which may not be suitable for all use cases.
* **`JSON.parse(JSON.stringify(obj))`**:
	+ Pros: Simple, lightweight, and widely supported.
	+ Cons: Can create unexpected behavior if the object contains cyclic references or certain primitive values (e.g., `NaN`, `Infinity`).

**Library and Purpose**

In this benchmark, Lodash is a popular JavaScript utility library that provides various functions for tasks like array manipulation, string manipulation, and more. The `cloneDeep` function is part of Lodash's deep object manipulation module.

**Special JS Features or Syntax**

There are no special JS features or syntax used in these benchmarks. They focus on the performance comparison of three distinct methods for creating object copies.

**Other Alternatives**

If you need to create a copy of an object, other alternatives include:

* `Object.assign()`: Creates a shallow copy of an object by copying all own enumerable properties.
* `Array.prototype.slice()` or `Array.prototype.reduce()`: Can be used to create a shallow copy of an array (or an object that is converted to an array).
* **Libraries like Immutable.js**: Provides immutable data structures and methods for creating copies.

Keep in mind that the choice of method depends on your specific use case, performance requirements, and personal preference.

Related benchmarks:

Lodash cloneDeep vs structuredClone vs JSON.stringify (small object) (version: 0)

https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

Comparing performance of: lodash vs structedClone (native) vs JSON.parse

Created: 3 years ago by: Guest

Jump to the latest result

lodash

structedClone (native)

JSON.parse

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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