Benchmark: Lodash deep clone vs Spread Clone

HTML Preparation code:

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

Script Preparation code:

window.obj = { foo: 'some string', bar: 'another', subObj: { hey: 'you', what: 'are you doing' } }

Tests:

Lodash deep clone
const objClone = _.cloneDeep(window.obj);
Spread
const objClone = {...window.obj};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash deep clone
Spread

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser/OS: Chrome 140 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Lodash deep clone	2137017.8 Ops/sec
Spread	78364648.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark is designed to compare two approaches for creating a deep clone of an object: using Lodash's `cloneDeep` method and using the spread operator (`...`) to create a shallow copy.

**Options Compared**

There are two options being compared:

1. **Lodash Deep Clone**: This option uses the `cloneDeep` function from the Lodash library to create a deep clone of the object. A deep clone creates a new object with the same structure as the original, but with separate values for each property.
2. **Spread Operator (Shallow Copy)**: This option uses the spread operator (`...`) to create a shallow copy of the object. A shallow copy creates a new object that contains references to the original properties, rather than copying the values themselves.

**Pros and Cons**

* **Lodash Deep Clone**: Pros:
	+ Ensures a deep clone, which is necessary for objects with nested structures.
	+ Can be slower due to the overhead of creating a new object and recursively cloning its properties.
* **Spread Operator (Shallow Copy)**: Pros:
	+ Faster than creating a deep clone, as it only requires copying property values rather than creating a new object.
	+ Suitable for objects with simple nested structures or when you don't need to preserve the original object's structure.

Cons:

* The spread operator only creates a shallow copy, which may not be suitable for all use cases (e.g., if you need to preserve the original object's structure).
* The performance difference between these two options is typically small, but it's still worth considering when optimizing code.

**Library and Purpose**

Lodash is a popular JavaScript library that provides various utility functions for tasks like array manipulation, string processing, and more. In this case, the `cloneDeep` function is used to create a deep clone of an object. The purpose of this function is to ensure that the cloned object has the same structure as the original, but with separate values for each property.

**Special JS Feature or Syntax**

In this benchmark, no special JavaScript features or syntax are being tested. However, if you're interested in exploring other options, some benchmarks may test specific features like:

* **Arrow functions**: Used to create concise and expressive code.
* **Async/await**: Used to write asynchronous code that's easier to read and maintain.

**Other Alternatives**

If you need to clone objects or arrays in JavaScript, there are several alternatives to Lodash's `cloneDeep` function:

1. **JSON.parse(JSON.stringify(obj))**: Creates a shallow copy of an object by serializing the original object as JSON and then parsing it back into an object.
2. **Object.assign()**: Creates a new object with properties copied from the original object. Note that this only creates a shallow copy, so if you need to preserve the original object's structure, use one of the other methods mentioned above.

In summary, the benchmark is designed to compare two approaches for creating a deep clone of an object: using Lodash's `cloneDeep` method and using the spread operator (`...`) to create a shallow copy. The choice between these options depends on your specific use case and performance requirements.

Related benchmarks:

Lodash deep clone vs Spread Clone (version: 0)

Comparing performance of: Lodash deep clone vs Spread

Created: 5 years ago by: Guest

Jump to the latest result

Lodash deep clone

Spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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