Benchmark: Object cloning with Lodash clone vs ES6 object spread vs ES6 Object.assign vs Json

HTML Preparation code:

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

Script Preparation code:

var o = {
 a: {
   b: 1,
   c: 2,
   d: 3,
   j: {
     k: [1,2,3],
     l: [4,5,6]
   },
 },
 e: [1,2,3,4,5,6],
 f: 1,
 g: {
   h: 1,
 }
}

Tests:

Lodash clone
const a = _.clone(o)
ES6 spread
const a = { ...o }
ES6 Object.assign
const a = Object.assign({}, o)
Json
const a = JSON.parse(JSON.stringify(o))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash clone
ES6 spread
ES6 Object.assign
Json

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Lodash clone	4848486.5 Ops/sec
ES6 spread	67636848.0 Ops/sec
ES6 Object.assign	51091688.0 Ops/sec
Json	1274177.4 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark measures the performance of different approaches for creating a deep clone of an object. The test case uses a sample object `o` with nested properties and arrays, which is then cloned using four different methods:

1. **Lodash clone**: Uses the `_clone()` function from the Lodash library to create a deep copy of the object.
2. **ES6 spread**: Uses the syntax `{ ...o }` to create a shallow copy of the object (not suitable for deep cloning).
3. **ES6 Object.assign**: Uses the `Object.assign()` method with an empty object as the target to create a shallow copy of the object (not suitable for deep cloning).
4. **Json**: Uses `JSON.parse(JSON.stringify(o))` to create a deep clone of the object.

**Library and Syntax**

* Lodash is a popular JavaScript utility library that provides various functions for tasks like array manipulation, string formatting, and more. In this case, it's used for creating a deep clone of the object.
* ES6 spread (`{ ...o }`) is a shorthand syntax for creating a new object with all the properties of `o`. While it can be useful for shallow cloning, it doesn't work well for deep cloning due to issues like circular references.

**Pros and Cons**

Here's a brief summary of each approach:

1. **Lodash clone**: Pros:
	* Works well for deep cloning, including handling circular references.
	* Provides a more reliable way to create a deep copy of an object.
Cons:
	* Requires the Lodash library to be included in the test environment.
2. **ES6 spread**: Cons:
	* Only works for shallow cloning (not suitable for deep cloning).
	* May not handle circular references correctly.
Pros:
	* Easy to use and concise syntax.
	* No additional library required.
3. **ES6 Object.assign**: Cons:
	* Only works for shallow cloning (not suitable for deep cloning).
	* May not handle circular references correctly.
Pros:
	* Simple syntax and no additional library required.
4. **Json**: Pros:
	* Works well for deep cloning, including handling circular references.
Cons:
	* Requires JSON parsing and stringification, which can be slower than Lodash's clone function.

**Other Considerations**

When choosing a method for deep cloning an object, consider the following factors:

* Performance: Lodash's clone function is likely to be faster than using JSON parsing and stringification.
* Code readability: Using Lodash's clone function or ES6 spread can make your code more readable by explicitly stating the intent of creating a new object.
* Library dependencies: If you need to include an additional library (Lodash), consider whether it's worth the extra weight.

**Alternatives**

If you don't want to use Lodash, you could explore other libraries like:

* `lodash-deep-clone` or `deep-clone`: Specialized deep cloning libraries that are smaller and faster than Lodash.
* `JSON.parse(JSON.stringify())` with a custom implementation for handling circular references.

Keep in mind that these alternatives might have different trade-offs in terms of performance, code readability, and library dependencies.

Related benchmarks:

Object cloning with Lodash clone vs ES6 object spread vs ES6 Object.assign vs Json (version: 0)

Comparing performance of: Lodash clone vs ES6 spread vs ES6 Object.assign vs Json

Created: 7 years ago by: Registered User

Jump to the latest result

Lodash clone

ES6 spread

ES6 Object.assign

Json

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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