Benchmark: Deep merge: lodash vs ramda vs Object spread

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>

Tests:

lodash deep merge
const a = { a: { c: { e: { h:4 }, f: 3 }, d: 2 }, b: 1 }; const b = { a: { c: { e: { g: true } } } }; const c = _.merge(a, b)
ramda deep merge
const a = { a: { c: { e: { h:4 }, f: 3 }, d: 2 }, b: 1 }; const b = { a: { c: { e: { g: true } } } }; const c = R.mergeDeepRight(a, b);
object spread deep merge
const a = { a: { c: { e: { h:4 }, f: 3 }, d: 2 }, b: 1 }; const b = { a: { c: { e: { g: true } } } }; const c = {...a, ...b, a: { ...a.a, ...b.b, c: { ...a.a.c, ...b.a.c, e: { ...a.a.c.e, ...b.a.c.e } } } };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash deep merge
ramda deep merge
object spread deep merge

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 dive into the explanation of the provided benchmark.

**Overview**

The benchmark compares three approaches for performing a deep merge operation on JavaScript objects:

1. Lodash (`_.merge`)
2. Ramda (`R.mergeDeepRight`)
3. Object spread operator (`...`)

**What is being tested?**

The benchmark tests how fast each approach can perform a deep merge operation between two objects. The objects have nested properties, which requires the merges to be recursive.

**Options compared**

Here's a brief overview of each option:

* **Lodash (`.merge`)**: Lodash provides a versatile utility function for merging objects. In this benchmark, it uses the `_.merge` function with the default settings.
* **Ramda (`.R.mergeDeepRight`)**: Ramda is a functional programming library that offers various utility functions. In this benchmark, it uses the `R.mergeDeepRight` function, which merges two objects in a deep and recursive manner, starting from the rightmost property.
* **Object spread operator (`...`)**: This is a new syntax introduced in ECMAScript 2018 (ES10). It allows you to merge two objects by spreading their properties into a new object.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Lodash (.merge)**:
	+ Pros: Easy to use, well-documented, and widely supported.
	+ Cons: May be slower than other approaches due to its iterative nature.
* **Ramda (R.mergeDeepRight)**:
	+ Pros: Fast, concise, and declarative.
	+ Cons: May be less intuitive for beginners due to its functional programming style.
* **Object spread operator (`...`)**:
	+ Pros: New syntax, easy to read and write, and fast.
	+ Cons: Requires modern browsers (ES10+) and may not work in older versions.

**Libraries used**

In the benchmark code, two libraries are used:

1. Lodash (`_.merge`)
2. Ramda (`R.mergeDeepRight`)

These libraries offer a convenient way to perform deep merges without having to implement them manually.

**Special JS features or syntax**

The Object spread operator (`...`) is a new feature introduced in ECMAScript 2018 (ES10). It allows you to merge two objects by spreading their properties into a new object.

**Other alternatives**

If these three approaches are not suitable, other alternatives include:

1. `Object.assign()`: A method that assigns the values of one or more source objects to a target object.
2. Recursive functions: You can write your own recursive function to perform the deep merge operation.
3. Libraries like Immutable.js or MapReduce.js: These libraries offer more advanced data processing and merging capabilities.

In summary, this benchmark compares three approaches for performing deep merges on JavaScript objects. Lodash provides a familiar utility function, Ramda offers a fast and concise solution, while the Object spread operator is a new syntax that's easy to read and write.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:132.0) Gecko/20100101 Firefox/132.0

Browser/OS: Firefox 132 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
lodash deep merge	1358215.4 Ops/sec
ramda deep merge	1242136.5 Ops/sec
object spread deep merge	3561702.2 Ops/sec

Related benchmarks:

Deep merge: lodash vs ramda vs Object spread (version: 0)

Deep merge: lodash vs ramda vs Object spread

Comparing performance of: lodash deep merge vs ramda deep merge vs object spread deep merge

Created: 3 years ago by: Guest

Jump to the latest result

lodash deep merge

ramda deep merge

object spread deep merge

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):