Benchmark: lodash merge vs deepmerge (updated)

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js'></script>
<script src='https://cdn.jsdelivr.net/npm/deepmerge@4.2.2/dist/cjs.min.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

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/95.0.4638.54 Safari/537.36

Browser/OS: Chrome 95 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash merge	207115.8 Ops/sec
deepmerge	431490.7 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll dive into the explanation of the provided benchmark.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark compares the performance of two library functions, `lodash.merge` and `deepmerge`, for merging objects with nested structures.

**Library Overview**

1. **Lodash**: Lodash is a popular JavaScript utility library developed by Yehuda Katz. It provides a wide range of functions for common tasks, such as array manipulation, object creation, and functional programming. In this benchmark, the `_` symbol is used to refer to the Lodash library.

2. **Deepmerge**: Deepmerge is another JavaScript library specifically designed for deep merging objects. Its primary purpose is to merge two or more objects with nested structures in a predictable and efficient manner.

**Benchmark Comparison**

The benchmark compares the performance of `lodash.merge` and `deepmerge` when merging two objects, `a` and `b`, which have nested structures. The test cases are identical for both functions:

```javascript
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);
```

```javascript
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);
```

**Options Compared**

Both `lodash.merge` and `deepmerge` offer different options for customizing the merge process. These options are not explicitly mentioned in the provided benchmark definition.

However, we can infer that these libraries provide some form of optionality, such as:

* Handling null or undefined values
* Preserving the source objects' properties
* Merging arrays or other data types

**Pros and Cons**

Here's a brief summary of the pros and cons for each library:

1. **Lodash.merge**
	* Pros:
		+ Wide range of features and utility functions.
		+ Well-established and widely adopted.
	* Cons:
		+ Can be slow for large, complex data structures.
		+ May introduce unnecessary complexity with its extensive feature set.

2. **Deepmerge**
	* Pros:
		+ Optimized for deep merging objects.
		+ Lightweight and efficient.
	* Cons:
		+ Limited features compared to Lodash.
		+ May not be suitable for more complex data structures.

**Other Considerations**

When choosing between `lodash.merge` and `deepmerge`, consider the specific requirements of your project:

* If you need a general-purpose utility library with a wide range of features, use Lodash.
* If you require an optimized deep merging solution, use Deepmerge.

Keep in mind that these libraries are designed to solve different problems. It's essential to evaluate their trade-offs and choose the best fit for your specific needs.

**Alternatives**

Other alternatives to `lodash.merge` and `deepmerge` include:

1. **JSON Merge Patch**: A lightweight library specifically designed for merging JSON objects.
2. **Mergify**: A fast and efficient deep merging library inspired by Lodash's merge function.
3. **Objectassign**: A built-in Node.js module for merging objects.

Each of these alternatives has its strengths and weaknesses, so it's crucial to evaluate them based on your specific requirements.

Related benchmarks:

lodash merge vs deepmerge (updated) (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 2 months ago):