Benchmark: Lodash cloneDeep vs structuredClone vs JSONparse

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 = _.cloneDeep(MyObject);
Native structuredClone
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 cloneDeep
Native structuredClone
json.parse

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark test cases and explanations.

**Benchmark Overview**

The benchmark compares three methods for creating a deep copy of an object in JavaScript:

1. Lodash's `cloneDeep` function
2. The native `structuredClone` function (available in modern browsers)
3. The `JSON.parse(JSON.stringify())` method

**Options Compared**

* **Lodash's `cloneDeep`**: This is a custom implementation of deep cloning using the Lodash library.
	+ Pros: Easy to use, provides more features than just deep copying (e.g., handling circular references).
	+ Cons: Requires an additional dependency (the Lodash library), may have performance overhead due to its implementation.
* **Native `structuredClone`**: This is a modern browser function that creates a deep copy of an object.
	+ Pros: Fast, efficient, and lightweight, as it's implemented in the browser's engine.
	+ Cons: Not widely supported (only available in modern browsers), may have performance issues if not optimized.
* **`JSON.parse(JSON.stringify())`**: This method uses the `JSON.stringify()` function to serialize the object and then parses the resulting string back into an object.
	+ Pros: Fast, lightweight, and widely supported (available in all browsers).
	+ Cons: May not handle circular references correctly, can be slower than native `structuredClone` for large objects.

**Library and Functionality**

* **Lodash's `cloneDeep`**: Lodash is a popular JavaScript utility library that provides a variety of functions for working with data structures. `cloneDeep` is a specific function that creates a deep copy of an object.
	+ Purpose: To provide a convenient way to create a deep copy of objects, handling circular references and other edge cases.

**Special JS Feature or Syntax**

* **Native `structuredClone`**: This function was introduced in ECMAScript 2020 (ES2020) as part of the WebAssembly binary format. It's designed to create a stable, efficient, and secure way to copy objects.
	+ Purpose: To provide a native, optimized way to create deep copies of objects, with features like handling circular references and memoization.

**Benchmark Preparation Code**

The benchmark preparation code creates an object `MyObject` with some properties (e.g., `description`, `myNumber`, `myBoolean`, and `jayson`) and then creates a null reference `myCopy`. This setup is used to test each cloning method on the same initial object.

**Alternative Cloning Methods**

There are other cloning methods available in JavaScript, including:

* **`Object.assign()`**: Creates a shallow copy of an object.
* **`Array.prototype.slice()`**: Creates a shallow copy of an array.
* **`JSON.parse(JSON.stringify())`**: As mentioned earlier, this method creates a deep copy of an object by serializing it and then parsing the resulting string back into an object.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.115 Safari/537.36

Browser/OS: Chrome 102 on Linux

View result in a separate tab

Test name	Executions per second
Lodash cloneDeep	165908.4 Ops/sec
Native structuredClone	50098.6 Ops/sec
json.parse	95370.6 Ops/sec

Related benchmarks:

Lodash cloneDeep vs structuredClone vs JSONparse (version: 0)

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

Comparing performance of: Lodash cloneDeep vs Native structuredClone vs json.parse

Created: 2 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Native structuredClone

json.parse

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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