Benchmark: lodash fp merge vs spread operator

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash-fp/0.10.4/lodash-fp.min.js'></script>

Script Preparation code:

var person = {name: 'Frederick', lastName: 'Corcino Alejo'};

Tests:

lodash
let copied = _.merge(person, {age: 15});
native
let copied = {...person};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
native

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36 Edg/140.0.0.0

Browser/OS: Chrome 140 on Windows

View result in a separate tab

Test name	Executions per second
lodash	3486974.2 Ops/sec
native	52156468.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Overview**

The benchmark measures the performance of two approaches for merging objects: Lodash's `merge` function (with functional programming style) and the spread operator (`...`) in native JavaScript.

**Script Preparation Code**

The script preparation code initializes an object `person` with properties `name` and `lastName`. This object will be used as a reference for merging.

**Html Preparation Code**

The HTML preparation code includes a link to load Lodash's functional programming version (version 0.10.4) from a CDN, which makes the library available for testing.

**Benchmark Definition**

There are two benchmark definitions:

1. `_.merge(person, {age: 15})`: This line uses Lodash's `merge` function with an object literal `{age: 15}` to merge the `person` object.
2. `let copied = {...person};`: This line uses the spread operator (`...`) to create a shallow copy of the `person` object.

**Comparison**

The benchmark compares the performance of these two approaches:

* Lodash's `merge` function (with functional programming style)
* Native JavaScript's spread operator

**Pros and Cons:**

1. **Lodash's `merge` function**:
	* Pros:
		+ More readable and maintainable code
		+ Easier to handle complex merge scenarios with nested objects
	* Cons:
		+ Performance overhead due to the use of a library
		+ May not be suitable for very large datasets or performance-critical applications
2. **Native JavaScript's spread operator**:
	* Pros:
		+ Lightweight and fast, as it's implemented in native code
		+ Suitable for most use cases with shallow objects
	* Cons:
		+ Less readable and maintainable code compared to Lodash's `merge` function
		+ May not handle complex merge scenarios well

**Library: Lodash**

Lodash is a popular utility library that provides various functions for tasks like array manipulation, string manipulation, and object manipulation. The functional programming version (version 0.10.4) used in this benchmark includes the `merge` function.

In this benchmark, Lodash's `merge` function is used to merge objects with nested properties. This allows for more complex merge scenarios compared to using the spread operator alone.

**Special JS Feature: None**

There are no special JavaScript features or syntax being tested in this benchmark. The focus is on comparing the performance of two existing approaches.

**Other Alternatives**

Other alternatives to Lodash's `merge` function or native JavaScript's spread operator could include:

* **Merging libraries**: Other libraries like jQuery, Underscore.js, or Ramda provide similar merge functions.
* **Custom implementations**: You can also implement your own merge functions using loops or recursive approaches.
* **Alternative data structures**: Depending on the specific use case, you might consider using alternative data structures like Immutable.js or MapReduce.

Keep in mind that each of these alternatives may have their own trade-offs and performance characteristics.

Related benchmarks:

lodash fp merge vs spread operator (version: 0)

lodash assign vs spread operator

Comparing performance of: lodash vs native

Created: 7 years ago by: Guest

Jump to the latest result

lodash

native

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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