Benchmark: Lodash cloneDeep VS spread operator v4.17.21

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

var MyObject = {
  description: 'a',
  myNumber: 123456789,
  myBoolean: true,
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Spread operator
myCopy = {...MyObject};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0

Browser/OS: Firefox 121 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Lodash cloneDeep	3288784.2 Ops/sec
Spread operator	24611062.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll explain the benchmark and its test cases in detail.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark is called "Lodash cloneDeep VS spread operator v4.17.21". This benchmark compares the performance of two approaches: using Lodash's `cloneDeep` function versus using the spread operator (`...`) with an object.

**Script Preparation Code**

The script preparation code is a JavaScript snippet that creates a test object, `MyObject`, which contains three properties: `description`, `myNumber`, and `myBoolean`. The variable `myCopy` is initialized as null. This object will be used to test the cloning functionality of Lodash's `cloneDeep` function or the spread operator.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library (version 4.17.21) from a CDN. This library is required for the benchmark, as it provides the `cloneDeep` function used in one of the test cases.

**Individual Test Cases**

There are two test cases:

1. **Lodash cloneDeep**
This test case uses Lodash's `cloneDeep` function to create a deep copy of the `MyObject`. The code is:
```javascript
myCopy = _.cloneDeep(MyObject);
```
The purpose of this test case is to measure the performance of creating a deep copy using Lodash's `cloneDeep` function.

**Pros and Cons**

Using Lodash's `cloneDeep` function:

* Pros: Provides a reliable and efficient way to create deep copies of objects.
* Cons: Requires including an additional library, which may introduce unnecessary overhead.

Using the spread operator (`...`) with an object:

* Pros: A lightweight and straightforward way to create shallow or deep copies of objects. It's also widely supported by most modern browsers and Node.js environments.
* Cons: May not work as expected for complex objects or nested structures.

**Other Considerations**

When using the spread operator, it's essential to note that it only creates a shallow copy of the object. If you need to create a deep copy, you'll need to use a recursive approach, such as:
```javascript
myCopy = Object.assign({}, MyObject);
```
Or use the `lodash` library with its `cloneDeep` function.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for tasks like string manipulation, array and object transformations, and more. In this benchmark, Lodash's `cloneDeep` function is used to create deep copies of objects. The `cloneDeep` function recursively traverses the original object, creating new objects with identical properties and values.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark. It's a straightforward comparison of two approaches using standard JavaScript concepts.

**Alternatives**

Other alternatives for cloning objects include:

* Using `JSON.parse(JSON.stringify(MyObject))`: This method creates a shallow copy of the object but can be slower and less efficient than other methods.
* Using `Array.prototype.slice.call(MyObject)`: This method creates a shallow copy of an array-like object, but it may not work as expected for objects with non-array properties.
* Implementing a custom cloning function using recursion or iteration.

Keep in mind that these alternatives might have different performance characteristics and use cases compared to Lodash's `cloneDeep` function.

Related benchmarks:

Lodash cloneDeep VS spread operator v4.17.21 (version: 0)

Comparing performance of: Lodash cloneDeep vs Spread operator

Created: 2 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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