Benchmark: lodash merge vs deepmerge vs ramda merge

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@3.2.0/dist/umd.js'></script>
<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.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);
object.assign
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);
ramda
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = R.mergeDeepLeft(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
object.assign
ramda

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing the performance of different libraries and approaches.

**Benchmark Definition Json**

The provided JSON represents a benchmark definition, which outlines the test cases:

* `Name`: The name of the benchmark, "lodash merge vs deepmerge vs ramda merge".
* `Description`: None.
* `Script Preparation Code`: A script that loads the required JavaScript libraries: Lodash, Deepmerge, and Ramda.
* `Html Preparation Code`: An HTML snippet that includes a script tag for each library.

**Individual Test Cases**

There are three individual test cases:

1. **Lodash Merge (`lodash merge`)**:
	* Benchmark Definition: Uses the `_` object from Lodash to create a new object with merged properties from two objects.
	* Purpose: Test the performance of Lodash's `merge` function.
2. **Object Assign (`object.assign`)**:
	* Benchmark Definition: Uses the `Object.assign()` method to merge two objects.
	* Purpose: Test the performance of the built-in `Object.assign()` method.
3. **Ramda Merge (`ramda`)**:
	* Benchmark Definition: Uses Ramda's `R.mergeDeepLeft()` function to create a new object with merged properties from two objects.
	* Purpose: Test the performance of Ramda's `mergeDeepLeft` function.

**Comparison of Approaches**

The three test cases compare different approaches for merging objects:

1. **Lodash Merge**: Uses a custom implementation in Lodash, which creates a new object with merged properties.
2. **Object Assign**: Uses the built-in `Object.assign()` method, which merges two objects into one.
3. **Ramda Merge**: Uses Ramda's `mergeDeepLeft` function, which recursively merges properties from two objects.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Lodash Merge**:
	+ Pros: Custom implementation can be optimized for performance.
	+ Cons: Requires loading Lodash library, which may have overhead.
* **Object Assign**:
	+ Pros: Built-in method with low overhead.
	+ Cons: May not provide optimal merging behavior for complex objects.
* **Ramda Merge**:
	+ Pros: Provides a clear and concise API for object merging.
	+ Cons: Requires loading Ramda library, which may have overhead.

**Library Descriptions**

1. **Lodash**: A popular JavaScript utility library that provides various functions for tasks such as array manipulation, string iteration, and object merging.
2. **Deepmerge**: A lightweight object merging library that provides a simple API for merging objects.
3. **Ramda**: A functional programming library that provides a wide range of functions for data processing, including object merging.

**Special JS Features or Syntax**

None mentioned in the provided benchmark definition json.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36 Edg/113.0.1774.42

Browser/OS: Chrome 113 on Windows

View result in a separate tab

Test name	Executions per second
lodash merge	272211.4 Ops/sec
object.assign	1573783.2 Ops/sec
ramda	1372400.4 Ops/sec

Related benchmarks:

lodash merge vs deepmerge vs ramda merge (version: 0)

Comparing performance of: lodash merge vs object.assign vs ramda

Created: 2 years ago by: Guest

Jump to the latest result

lodash merge

object.assign

ramda

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):