Benchmark: lodash merge vs deepmerge.all

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@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.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
lodash merge
deepmerge.all

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**What is being tested?**

The benchmark measures the performance of two libraries: Lodash (`lodash`) and DeepMerge (`deepmerge`). Both libraries are used to merge objects, but they have different approaches.

**Options compared**

The benchmark compares the following options:

1. **Lodash `_.merge()`**: This function merges two objects into a new object, preserving the structure of both input objects.
2. **DeepMerge `deepmerge.all()`**: This function takes an array of objects as input and returns a single merged object.

**Pros and Cons**

Here's a brief overview of each approach:

1. **Lodash `_.merge()`**:
	* Pros: Simple, straightforward implementation. Works well for simple merge scenarios.
	* Cons: Can lead to deep property merges, which may not be desirable in all cases. Requires the input objects to have similar structures.
2. **DeepMerge `deepmerge.all()`**:
	* Pros: More robust and flexible than Lodash's approach. Handles more complex merge scenarios, including nested objects. Supports custom merge strategies.
	* Cons: May introduce additional overhead due to its more complex implementation.

**Library and Purpose**

1. **Lodash**: A popular JavaScript utility library that provides a wide range of functions for tasks like string manipulation, array manipulation, and object manipulation (like merging). Lodash is widely used in the industry and has a large community of developers contributing to it.
2. **DeepMerge**: A lightweight JavaScript library specifically designed for deep merging objects. It's designed to be more efficient and flexible than other merge libraries.

**Special JS feature or syntax**

This benchmark doesn't seem to use any special JavaScript features or syntax that are not widely supported. The code uses standard JavaScript syntax and doesn't rely on any experimental or upcoming features.

**Other alternatives**

If you're interested in exploring alternative merge libraries, here are a few options:

1. **Immer**: A library for working with immutable objects, which can be used for merging.
2. **Fusion**: A library that allows you to compose and extend functions like `_.merge()` using a functional programming style.

Keep in mind that these alternatives may have different trade-offs and use cases compared to Lodash and DeepMerge.

Latest run results:

Run details: (Test run date: 10 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash merge	527949.4 Ops/sec
deepmerge.all	335453.5 Ops/sec

Related benchmarks:

lodash merge vs deepmerge.all (version: 0)

Comparing performance of: lodash merge vs deepmerge.all

Created: 4 years ago by: Guest

Jump to the latest result

lodash merge

deepmerge.all

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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