Benchmark: Spread Operator vs Lodash Small Array

HTML Preparation code:

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

Script Preparation code:

var arr = new Array(10).fill("");

Tests:

Spread Operator
[...arr];
Lodash Clone
_.clone(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread Operator
Lodash Clone

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36

Browser/OS: Chrome 96 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Spread Operator	10415121.0 Ops/sec
Lodash Clone	4166373.2 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided benchmark compares the performance of two approaches to clone an array: the spread operator and Lodash's `clone()` method.

**Options Compared**

There are two options being compared:

1. **Spread Operator**: This involves using the spread operator (`[...]`) to create a new array by spreading the contents of the original array.
2. **Lodash Clone**: This uses Lodash's `clone()` function to create a deep copy of the original array.

**Pros and Cons**

* **Spread Operator:**
	+ Pros:
		- Simple and concise syntax.
		- Creates a new array, avoiding mutation of the original array.
	+ Cons:
		- May not perform well for large arrays due to its iterative nature.
		- Can lead to unexpected behavior if used with complex data structures (e.g., objects).
* **Lodash Clone:**
	+ Pros:
		- Efficient and optimized for performance.
		- Handles complex data structures, including nested arrays and objects.
	+ Cons:
		- Requires the use of an external library (Lodash).
		- May have a slight overhead due to the additional function call.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, object iteration, and more. The `clone()` function used in this benchmark creates a deep copy of an array, which can be useful when working with complex data structures.

**Special JS Feature/Syntax**

There are no special JS features or syntaxes being used in this benchmark.

**Other Alternatives**

If you're interested in alternative approaches to cloning arrays, here are a few options:

* Using the `Array.prototype.slice()` method: This creates a shallow copy of an array.
* Using `JSON.parse(JSON.stringify(arr))`: This creates a deep copy of an array using JSON serialization and deserialization.
* Using a library like Immer or Ramda for more efficient and functional array manipulation.

**Benchmark Preparation Code**

The provided script preparation code creates a new array with 10 elements, filled with empty strings (`"````). The HTML preparation code includes the Lodash library as a CDN import.

**Individual Test Cases**

There are two test cases:

1. `Spread Operator`: This tests the performance of creating an array by spreading the contents of the original array.
2. `Lodash Clone`: This tests the performance of using Lodash's `clone()` function to create a deep copy of the original array.

Related benchmarks:

Spread Operator vs Lodash Small Array (version: 0)

Answering https://stackoverflow.com/questions/58702513/lodash-clone-array-vs-spread-operator#

Comparing performance of: Spread Operator vs Lodash Clone

Created: 5 years ago by: Guest

Jump to the latest result

Spread Operator

Lodash Clone

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):