Benchmark: Deep merge lodash vs ramda vs deepmerge vs Immutable

HTML Preparation code:

<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.min.js"></script>
<script src="https://raw.githubusercontent.com/lodash/lodash/4.17.15-npm/lodash.js"></script>
<script src="https://unpkg.com/deepmerge/dist/umd.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/immutable/4.3.4/immutable.min.js'></script>

Script Preparation code:

var obj1 = {
  a: 10,
  b: {
    b1: 'Hello',
    b2: {
      b2a: [1, 2, 3],
      b2b: {
        b2b1: 'Deep',
        b2b2: [4, 5, 6],
        b2b3: {
          b2b3a: 11,
          b2b3b: 'Nested'
        }
      }
    }
  },
  c: [7, 8, 9],
  d: 'World'
};

var obj2 = {
  a: 15,
  b: {
    b1: 'Hola',
    b2: {
      b2a: [10, 11, 12],
      b2b: {
        b2b1: 'Profundo',
        b2b2: [13, 14, 15],
        b2b3: {
          b2b3a: 16,
          b2b3b: 'Anidado',
          b2b3c: 'Nuevo Campo'
        }
      }
    },
    b3: 'Nuevo Campo'
  },
  e: 'Mundo',
  f: {
    f1: [16, 17, 18],
    f2: {
      f2a: 'Adicional',
      f2b: {
        f2b1: 17,
        f2b2: 'Más Profundo'
      }
    }
  }
};

Tests:

Ramda.mergeDeepRight
R.mergeDeepRight(obj1, obj2)
Lodash.merge
_.merge(obj1, obj2)
deepmerge
deepmerge(obj1, obj2)
Immutable
var g = Immutable.mergeDeep(obj1, obj2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Ramda.mergeDeepRight
Lodash.merge
deepmerge
Immutable

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Ramda.mergeDeepRight	2446494.2 Ops/sec
Lodash.merge	411156.4 Ops/sec
deepmerge	261771.0 Ops/sec
Immutable	413240.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarks.

**Benchmark Definition**

The benchmark is designed to compare the performance of four different libraries for performing deep merges:

1. Lodash (`_.merge`)
2. Ramda (`Ramda.mergeDeepRight`)
3. Deep Merge (`deepmerge`)
4. Immutable (`Immutable.mergeDeep`)

**What are we testing?**

We're testing how quickly each library can merge two objects, `obj1` and `obj2`, while preserving the structure of the original objects.

**Options compared**

The four libraries have different approaches to performing deep merges:

* Lodash uses a simple recursive approach, where it iterates through the properties of both objects and combines them.
* Ramda uses a functional programming style, where it uses higher-order functions to compose the merge operation. `mergeDeepRight` is similar to Lodash's approach but with some additional features.
* Deep Merge uses a more efficient algorithm that avoids unnecessary copies of data.
* Immutable uses a immutable data structure approach, where it creates a new object that represents the merged result.

**Pros and Cons**

Here are some pros and cons for each library:

* Lodash:
	+ Pros: Simple to use, well-documented, widely supported.
	+ Cons: Not optimized for performance, can create unnecessary copies of data.
* Ramda:
	+ Pros: Functional programming style, composability, good performance.
	+ Cons: Steeper learning curve, may be overkill for simple merges.
* Deep Merge:
	+ Pros: Optimized for performance, efficient algorithm.
	+ Cons: Limited documentation, less widely supported than other libraries.
* Immutable:
	+ Pros: Immutable data structure approach, predictable behavior.
	+ Cons: Can be slower due to the overhead of creating new objects.

**Library explanations**

1. Lodash (`_.merge`): Lodash is a popular utility library that provides a wide range of functions for common tasks, including array manipulation and object merging. The `merge` function takes two objects as input and returns a new object with the combined properties.
2. Ramda (`Ramda.mergeDeepRight`): Ramda is a functional programming library that provides a series of higher-order functions for composing operations. `mergeDeepRight` is similar to Lodash's approach but uses a more functional programming style, which can lead to more predictable and composable code.
3. Deep Merge (`deepmerge`): Deep Merge is a lightweight library specifically designed for deep merging objects. It uses an efficient algorithm that avoids unnecessary copies of data.
4. Immutable (`Immutable.mergeDeep`): Immutable is a library that provides immutable data structures and algorithms for manipulating them. `mergeDeep` uses this approach to create a new object with the combined properties.

**Other alternatives**

If you're interested in exploring other libraries or approaches, here are some alternatives:

* Other deep merging libraries: Such as merge-deep or merge-object.
* Immutable data structure libraries: Such as MuJS or TypeScript's built-in immutable types.
* Functional programming libraries: Such as Elm or Haskell.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

Deep merge lodash vs ramda vs deepmerge vs Immutable (version: 5)

Comparing performance of: Ramda.mergeDeepRight vs Lodash.merge vs deepmerge vs Immutable

Created: 2 years ago by: Registered User

Jump to the latest result

Ramda.mergeDeepRight

Lodash.merge

deepmerge

Immutable

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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