Benchmark: My lodash vs deepmerge vs deepmerge-ts

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.6.2/lodash.min.js'></script>
<script src='https://unpkg.com/deepmerge@4.2.2/dist/umd.js'></script>
<script type="module">
import { deepmerge } from 'https://unpkg.com/deepmerge-ts@4.2.1/dist/node/index.mjs';
window.deepmergeTs = deepmerge;
</script>

Tests:

lodash
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); const x = { foo: { bar: 3 }, array: [{ does: 'work', too: [ 1, 2, 3 ] }] } const y = { foo: { baz: 4 }, quux: 5, array: [{ does: 'work', too: [ 4, 5, 6 ] }, { really: 'yes' }] } var z = _.merge(x, y);
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); const x = { foo: { bar: 3 }, array: [{ does: 'work', too: [ 1, 2, 3 ] }] } const y = { foo: { baz: 4 }, quux: 5, array: [{ does: 'work', too: [ 4, 5, 6 ] }, { really: 'yes' }] } var z = deepmerge(x, y);
deepmerge-ts
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); const x = { foo: { bar: 3 }, array: [{ does: 'work', too: [ 1, 2, 3 ] }] } const y = { foo: { baz: 4 }, quux: 5, array: [{ does: 'work', too: [ 4, 5, 6 ] }, { really: 'yes' }] } var z = deepmergeTs(x, y);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
deepmerge
deepmerge-ts

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash	227577.8 Ops/sec
deepmerge	263234.4 Ops/sec
deepmerge-ts	433567.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark measures the performance of three different libraries: Lodash, DeepMerge, and DeepMerge-ts, which are used to merge objects in JavaScript. The test case involves creating two objects, `a` and `b`, with nested structures, and then merging them using each library to produce a third object, `z`.

**Tested Options**

The benchmark compares the performance of three options:

1. **Lodash**: Lodash is a popular utility library for JavaScript that provides a wide range of functions for working with data, including object manipulation.
2. **DeepMerge**: DeepMerge is a lightweight library specifically designed for merging objects in JavaScript. It aims to be fast and efficient while also being easy to use.
3. **DeepMerge-ts**: DeepMerge-ts is the TypeScript version of DeepMerge, which provides type safety benefits for developers working with TypeScript.

**Pros and Cons**

Here are some pros and cons of each option:

* **Lodash**:
	+ Pros: Lodash has a large community of users and contributors, making it well-maintained and widely supported. It also provides a wide range of utility functions beyond object merging.
	+ Cons: Lodash can be heavy-handed in its approach to function creation, which may lead to slower performance compared to specialized libraries like DeepMerge.
* **DeepMerge**:
	+ Pros: DeepMerge is designed specifically for object merging and is lightweight, making it well-suited for performance-critical applications. It also has a simple and easy-to-use API.
	+ Cons: DeepMerge is relatively new and may not have the same level of community support as Lodash.
* **DeepMerge-ts**:
	+ Pros: As the TypeScript version of DeepMerge, DeepMerge-ts provides type safety benefits for developers working with TypeScript. It also inherits the performance benefits of its JavaScript counterpart.
	+ Cons: Since it's a new library, there may not be as much community support or resources available compared to Lodash.

**Library and Purpose**

* **Lodash**: A utility library that provides a wide range of functions for working with data, including object manipulation. Its purpose is to provide a comprehensive set of functions for tasks such as array manipulation, string manipulation, and more.
* **DeepMerge**: A lightweight library specifically designed for merging objects in JavaScript. Its purpose is to provide an efficient and easy-to-use way to merge objects, which can be useful in performance-critical applications.

**Special JS Feature or Syntax**

There are no special JS features or syntaxes used in this benchmark. However, it's worth noting that DeepMerge-ts uses TypeScript's type system to ensure type safety benefits for developers working with TypeScript.

**Alternatives**

If you're looking for alternatives to these libraries, here are a few options:

* **Immer**: A library for immutably updating objects in JavaScript. While not specifically designed for merging objects, it can be used as an alternative.
* **Objectassign**: A built-in JavaScript function for creating a new object by copying properties from one or more source objects. While not as efficient as DeepMerge, Objectassign is a lightweight alternative.
* **Loose Equals**: Another lightweight library for merging objects in JavaScript.

Related benchmarks:

My lodash vs deepmerge vs deepmerge-ts (version: 0)

Comparing performance of: lodash vs deepmerge vs deepmerge-ts

Created: 3 months ago by: Guest

Jump to the latest result

lodash

deepmerge

deepmerge-ts

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):