Benchmark: lodash merge vs deepmerge 4.2.2

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@4.2.2/dist/umd.js'></script>

​x
 
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
​
<script src='https://unpkg.com/deepmerge@4.2.2/dist/umd.js'></script>

Script Preparation code:

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);

 
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);

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);

 
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);

 
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

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
lodash
deepmerge

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:103.0) Gecko/20100101 Firefox/103.0

Browser/OS: Firefox 103 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
lodash	481645.0 Ops/sec
deepmerge	749370.9 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

Let's break down what's being tested in this benchmark.

Benchmark Overview

The benchmark compares the performance of two JavaScript libraries: Lodash and DeepMerge (version 4.2.2). The test case uses two objects, a and b, with nested structures, to simulate a common use case for merging two objects.

Options Compared

The benchmark tests the following options:

Lodash: Specifically, it tests the _merge() function from Lodash.
DeepMerge: A pure JavaScript library designed for merging objects without the need for Lodash or other dependencies.

Pros and Cons of Each Approach

Lodash:

Pros:

Wide support in popular JavaScript frameworks (e.g., React, Angular)
Mature ecosystem with many plugins and utilities
Well-documented and actively maintained

Cons:

Additional dependency required (approximately 30KB gzipped)
May not be suitable for smaller projects or those targeting older browsers
Not designed specifically for pure JavaScript performance optimization

DeepMerge:

Pros:

Lightweight (approximately 15KB gzipped) and minimal dependencies
Specifically designed for merging objects without additional libraries
Fast and optimized for performance

Cons:

Smaller community compared to Lodash, which may impact support and documentation quality
Not as widely supported in popular frameworks or older browsers

Library Purpose

The lodash library is a comprehensive collection of utility functions for functional programming tasks. It provides a wide range of features beyond object merging, such as array manipulation, functional operations, and more.

In the context of this benchmark, Lodash's _merge() function is used to combine two objects into one. The function takes an optional third argument (the result) and merges objects using a specified strategy (defaulting to deep if not provided).

The deepmerge library, on the other hand, is specifically designed for merging objects in a deep, recursive manner without relying on additional libraries like Lodash.

Special JS Feature or Syntax

Neither of the tested libraries utilizes any special JavaScript features or syntax. However, both implementations take advantage of JavaScript's built-in object properties and methods (e.g., Object.assign(), { property: value }) to perform their respective merging operations.

Other Alternatives

For those looking for alternative approaches:

Underscore.js: Another popular utility library that includes a _merge() function similar to Lodash.
JSON Merge Patch: A lightweight JavaScript library specifically designed for merging JSON objects in a patch-based approach.
JSON Merge Sort: An alternative sorting method for object merges, which can be used instead of the traditional deep recursive merge.

Keep in mind that each alternative has its own trade-offs and suitability for specific use cases.

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this benchmark.

**Benchmark Overview**

The benchmark compares the performance of two JavaScript libraries: Lodash and DeepMerge (version 4.2.2). The test case uses two objects, `a` and `b`, with nested structures, to simulate a common use case for merging two objects.

**Options Compared**

The benchmark tests the following options:

1. **Lodash**: Specifically, it tests the `_merge()` function from Lodash.
2. **DeepMerge**: A pure JavaScript library designed for merging objects without the need for Lodash or other dependencies.

**Pros and Cons of Each Approach**

**Lodash:**

Pros:

* Wide support in popular JavaScript frameworks (e.g., React, Angular)
* Mature ecosystem with many plugins and utilities
* Well-documented and actively maintained

Cons:

* Additional dependency required (approximately 30KB gzipped)
* May not be suitable for smaller projects or those targeting older browsers
* Not designed specifically for pure JavaScript performance optimization

**DeepMerge:**

Pros:

* Lightweight (approximately 15KB gzipped) and minimal dependencies
* Specifically designed for merging objects without additional libraries
* Fast and optimized for performance

Cons:

* Smaller community compared to Lodash, which may impact support and documentation quality
* Not as widely supported in popular frameworks or older browsers

**Library Purpose**

The `lodash` library is a comprehensive collection of utility functions for functional programming tasks. It provides a wide range of features beyond object merging, such as array manipulation, functional operations, and more.

In the context of this benchmark, Lodash's `_merge()` function is used to combine two objects into one. The function takes an optional third argument (the result) and merges objects using a specified strategy (defaulting to `deep` if not provided).

The `deepmerge` library, on the other hand, is specifically designed for merging objects in a deep, recursive manner without relying on additional libraries like Lodash.

**Special JS Feature or Syntax**

Neither of the tested libraries utilizes any special JavaScript features or syntax. However, both implementations take advantage of JavaScript's built-in object properties and methods (e.g., `Object.assign()`, `{ property: value }`) to perform their respective merging operations.

Other Alternatives

For those looking for alternative approaches:

1. **Underscore.js**: Another popular utility library that includes a `_merge()` function similar to Lodash.
2. **JSON Merge Patch**: A lightweight JavaScript library specifically designed for merging JSON objects in a patch-based approach.
3. **JSON Merge Sort**: An alternative sorting method for object merges, which can be used instead of the traditional deep recursive merge.

Keep in mind that each alternative has its own trade-offs and suitability for specific use cases.

Related benchmarks:

lodash merge vs deepmerge 4.2.2 (version: 0)

Comparing performance of: lodash vs deepmerge

Created: 2 years ago by: Guest

Jump to the latest result

lodash

deepmerge

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):