Benchmark: JavaScript spread operator vs Object.assign vs Lodash.clone 2

HTML Preparation code:

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

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world', moreData: 'foo bar' } const finalObject = { ...firstObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world', moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject);
Using lodash.clone
const firstObject = { sampleData: 'Hello world', moreData: 'foo bar' } const finalObject = _.clone(firstObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.assign
Using lodash.clone

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarking.

The provided JSON represents a benchmark test case that compares three different approaches for cloning an object in JavaScript: using the spread operator (`...`), `Object.assign()`, and Lodash's `clone()` function.

**What is being tested?**

In this test case, we're creating two identical objects, `firstObject` and `finalObject`. The goal is to measure how long it takes to create a new object by cloning the existing one using each of the three methods mentioned above. The test case is designed to compare the performance of these different approaches under the same conditions.

**What options are being compared?**

We're comparing three options:

1. **Using the spread operator (`...`)**: This involves creating a new object by spreading the properties of an existing object into it, like this: `const finalObject = { ...firstObject };`.
2. **Using Object.assign()**: This method takes an existing object and creates a new one with the same properties, like this: `const finalObject = Object.assign({}, firstObject);`.
3. **Using Lodash's clone() function**: This is a specialized function from the Lodash library that creates a deep copy of an object, like this: `const finalObject = _.clone(firstObject);`.

**What are the pros and cons of each approach?**

Here's a brief summary:

1. **Spread operator (`...`)**:
	* Pros: concise syntax, easy to read and write.
	* Cons: can be slow for large objects or complex cloning scenarios.
2. **Object.assign()**:
	* Pros: widely supported in modern browsers, simple to use.
	* Cons: can lead to unexpected behavior if not used carefully (e.g., when working with arrays).
3. **Lodash's clone() function**:
	* Pros: specifically designed for cloning objects, handles complex scenarios and large data structures efficiently.
	* Cons: requires an additional library dependency (Lodash).

**Other considerations**

When choosing a cloning method, consider the following:

* Are you dealing with small, simple objects or larger, more complex data structures?
* Do you need to clone nested objects or arrays?
* Are performance concerns critical for your application?

**What is the Lodash library?**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as object manipulation, array iteration, and function composition. In this test case, we're using the `clone()` function from Lodash to create a deep copy of an object.

**Special JS feature or syntax used**

In this benchmark, we're using the spread operator (`...`) which is a relatively recent addition to JavaScript (introduced in ES2015). The spread operator allows us to easily create new objects by spreading the properties of existing ones into them.

**Alternatives**

If you don't need the specific features provided by Lodash's clone() function or the spread operator, alternative approaches might include:

* Using a library like Immutable.js for managing immutable data structures.
* Implementing your own custom cloning functions using plain JavaScript objects and methods (e.g., `Object.keys()` and `for...in` loops).

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36

Browser/OS: Chrome 67 on Windows

View result in a separate tab

Test name	Executions per second
Using the spread operator	3378509.5 Ops/sec
Using Object.assign	2106846.2 Ops/sec
Using lodash.clone	1550637.9 Ops/sec

Related benchmarks:

JavaScript spread operator vs Object.assign vs Lodash.clone 2 (version: 0)

Comparing performance of: Using the spread operator vs Using Object.assign vs Using lodash.clone

Created: 6 years ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.assign

Using lodash.clone

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated 29 days ago):