Benchmark: lodash vs spread w/array

HTML Preparation code:

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

Tests:

lodash
var a = { a: 'oh', b: 'my', arr: ['something'] }; var b = { c: 'goddess', arr: ['something', 'other'] }; var c = _.merge(a, b);
spread
var a = { a: 'oh', b: 'my', arr: ['something'] }; var b = { c: 'goddess', arr: ['something', 'other'] }; var c = { ...a, ...b, arr: [...a.arr, ...b.arr] };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
spread

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 3 days ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in this benchmark.

**Benchmark Overview**

The benchmark compares the performance of two approaches for merging objects: using Lodash (`_merge` function) and using JavaScript's spread operator (`...`).

**Test Cases**

There are two test cases:

1. **Lodash**: The benchmark uses Lodash version 4.17.5 to merge two objects, `a` and `b`, into a new object `c`. The `_.merge(a, b)` function is used to perform the merging.
2. **Spread Operator**: The second test case uses JavaScript's spread operator (`...`) to merge two objects, `a` and `b`, into a new object `c`. The syntax `{ ...a, ...b, arr: [...a.arr, ...b.arr] }` is used to perform the merging.

**Options Compared**

The benchmark compares the performance of these two approaches:

* **Lodash**: uses the `_merge` function from Lodash
* **Spread Operator**: uses JavaScript's spread operator (`...`) with array concatenation

**Pros and Cons**

**Lodash:**

Pros:

* More concise code for merging objects
* Reduces boilerplate code

Cons:

* Requires an external library (Lodash)
* May have overhead due to the library's initialization and dependencies

**Spread Operator:**

Pros:

* Native JavaScript feature with no additional libraries required
* Fast and efficient, as it leverages the optimized JavaScript engine

Cons:

* More verbose code for merging objects
* Requires explicit handling of array concatenation

**Other Considerations**

* The benchmark uses a simple object merge scenario to compare the performance of these two approaches. In real-world scenarios, more complex data structures (e.g., nested objects or arrays) may be involved.
* Lodash is widely used and has a large community, making it a popular choice for merging objects. However, this also means that there may be additional dependencies and potential security concerns.

**Library Used**

Lodash (`_merge` function) is a popular JavaScript utility library that provides various functions for tasks like array manipulation, object merging, and more. In this benchmark, Lodash is used to provide the `_merge` function, which performs the object merge operation.

**Special JS Feature/Syntax**

The spread operator (`...`) is a native JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for concise object creation and array manipulation by spreading arrays or objects into new ones. In this benchmark, the spread operator is used with array concatenation to merge the `arr` properties of both objects.

Overall, this benchmark provides a simple yet informative comparison between using Lodash's `_merge` function and JavaScript's spread operator for merging objects.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Browser/OS: Chrome 104 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash	1643860.0 Ops/sec
spread	2665863.0 Ops/sec

Related benchmarks:

lodash vs spread w/array (version: 0)

Comparing performance of: lodash vs spread

Created: 2 years ago by: Guest

Jump to the latest result

lodash

spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 3 days ago):