Benchmark: lodash merge 4.17.21 vs deepmerge 4.2.2

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js'></script>
<script src='https://unpkg.com/deepmerge@4.2.2/dist/umd.js'></script>

Tests:

lodash 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
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = deepmerge(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
deepmerge

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days 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 JavaScript libraries: Lodash and DeepMerge. The goal is to measure which library is faster when merging objects.

**Library Comparison**

1. **Lodash**: Lodash is a popular JavaScript utility library that provides a lot of features out of the box, such as array manipulation, object transformation, and functional programming helpers. In this benchmark, Lodash is used for its `merge` function, which combines two or more objects into a single object.
2. **DeepMerge**: DeepMerge is a lightweight JavaScript library specifically designed for deep merging objects. It's known for being fast and efficient in handling complex object structures.

**Comparison Options**

The benchmark presents two options:

1. **Lodash Merge (4.17.21)**: This version of the Lodash `merge` function uses a recursive approach to combine objects.
2. **DeepMerge (4.2.2)**: As mentioned earlier, DeepMerge is designed specifically for deep merging objects and is known for its speed.

**Pros and Cons**

* **Lodash Merge**:
	+ Pros: Provides more features beyond just object merging, such as array manipulation and functional programming helpers.
	+ Cons: May be slower due to the overhead of additional features and a more complex implementation.
* **DeepMerge**:
	+ Pros: Optimized for deep merging objects, known for being fast and efficient.
	+ Cons: Limited functionality compared to Lodash.

**Library-Specific Considerations**

When using these libraries, keep in mind:

* For Lodash, you'll need to include the entire library in your project if you only need the `merge` function. This can increase bundle size and loading times.
* DeepMerge is a lightweight solution that's easy to include in your project.

**Special JS Features/Syntax**

None mentioned in this benchmark.

**Other Alternatives**

If you're looking for alternative libraries for deep merging objects, consider:

1. **Immer**: A library that provides a safer, more efficient way to update objects.
2. **JSON Merge Patch (JMP)**: A lightweight library that allows for fast and efficient object merging.

When choosing an alternative, weigh the trade-offs between features, performance, and simplicity.

That's a summary of this JavaScript microbenchmark!

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/89.0.4389.82 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash merge	107655.0 Ops/sec
deepmerge	108121.1 Ops/sec

Related benchmarks:

lodash merge 4.17.21 vs deepmerge 4.2.2 (version: 0)

Comparing performance of: lodash merge vs deepmerge

Created: 3 years ago by: Guest

Jump to the latest result

lodash merge

deepmerge

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):