Benchmark: lodash merge vs deepmerge 2

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src='https://unpkg.com/deepmerge@3.2.0/dist/umd.js'></script>

Tests:

_.merge
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = _.merge({}, a, b);
deepmerge.all
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = deepmerge.all([{}, a, b]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.merge
deepmerge.all

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the provided benchmark and explain what's being tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Overview**

The benchmark tests the performance of two JavaScript libraries: Lodash (`_.merge`) and DeepMerge (specifically `deepmerge.all`).

**Lodash (`_.merge`)**

Lodash is a popular JavaScript utility library that provides a wide range of functions for various tasks. The `_merge` function is used to merge two or more objects into a single object.

**DeepMerge (`deepmerge.all`)**

DeepMerge is another popular JavaScript library that specializes in merging objects, arrays, and other data structures. `deepmerge.all` is a function that merges multiple objects into one.

**Test Cases**

The benchmark consists of two test cases:

1. **Lodash (`_.merge`)**
	* The script preparation code includes the Lodash library.
	* The benchmark definition creates two objects, `a` and `b`, and then uses `_merge` to merge them into a single object `c`.
2. **DeepMerge (`deepmerge.all`)**

The script preparation code includes both Lodash and DeepMerge libraries.

The benchmark definition is similar to the first test case, but instead of using `_merge`, it uses `deepmerge.all` to merge objects `a` and `b`.

**Comparison**

Both libraries are used to merge two objects into one. The main difference lies in their implementation:

* Lodash's `_merge` function performs a shallow merge, which means it only merges the top-level properties of the input objects.
* DeepMerge's `deepmerge.all` function performs a deep merge, which recursively merges all nested properties of the input objects.

**Pros and Cons**

* **Lodash (`_.merge`)**
	+ Pros:
		- Shallow merge can be faster for simple objects with only top-level properties.
		- Widely supported and well-maintained library.
	+ Cons:
		- May not work correctly for deeply nested objects.
		- Requires the Lodash library to be included in the script.
* **DeepMerge (`deepmerge.all`)**
	+ Pros:
		- Performs deep merges, making it suitable for more complex object structures.
		- Optimized for performance and can handle large inputs efficiently.
	+ Cons:
		- May have a higher overhead due to its recursive nature.

**Other Considerations**

* **Library Purpose**: Both libraries are designed to simplify common data manipulation tasks. However, DeepMerge is specifically optimized for merging objects and arrays, making it a better choice when dealing with complex data structures.
* **Performance**: For simple object merges, Lodash's shallow merge might be sufficient. However, for more complex datasets or performance-critical applications, DeepMerge's deep merge might provide a noticeable advantage.

**Alternatives**

If you're not tied to using these specific libraries, you can consider other JavaScript libraries and implementations, such as:

* **JSON Merge Patch**: A lightweight library that provides a simple way to merge two objects.
* **Object.assign()**: A built-in JavaScript method for merging properties from one or more source objects into a target object.

Keep in mind that each alternative has its own trade-offs and use cases. Be sure to evaluate your specific requirements and performance needs before choosing an implementation.

Related benchmarks:

lodash merge vs deepmerge 2 (version: 0)

Comparing performance of: _.merge vs deepmerge.all

Created: 6 years ago by: Guest

Jump to the latest result

_.merge

deepmerge.all

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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