Benchmark: lodash merge vs deepmerge MR

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>

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);
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);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
deepmerge

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.81 Safari/537.36

Browser/OS: Chrome 104 on Windows

View result in a separate tab

Test name	Executions per second
lodash merge	281314.2 Ops/sec
deepmerge	1616219.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring performance differences between two JavaScript libraries, `lodash` and `deepmerge`, is the primary goal of this benchmark.

**Library Overview**

*   **_lodash_**: A utility library providing functional programming helpers. It's a popular choice for its extensive feature set and simplicity. `_lodash.merge()` is used to merge objects recursively.
*   **DeepMerge**: A lightweight, recursive object merger designed to produce deeper merges than standard `Object.assign()`. It's ideal for scenarios involving deeply nested objects.

**Comparison Overview**

The provided benchmark compares the performance of:

1.  `_lodash.merge()`
2.  `deepmerge()`

**Options Compared**

*   **`_lodash.merge()`**: Uses a recursive approach to merge objects, which can lead to slower performance for very large or deeply nested objects.
*   **`deepmerge()`**: Employs a more efficient algorithm, leveraging caching and memoization to reduce the number of function calls, resulting in faster execution times.

**Pros and Cons**

1.  **_lodash.merge():**
    *   Pros:
        *   Wide support for various JavaScript environments
        *   Robust feature set for functional programming tasks
    *   Cons:
        *   Can be slower for very large or deeply nested objects due to recursive nature
2.  `deepmerge():`
    *   Pros:
        *   Optimized performance, especially for large or deeply nested objects
        *   Caching and memoization reduce unnecessary computations
    *   Cons:
        *   Less comprehensive feature set compared to `_lodash`

**Library Libraries Used**

In the provided benchmark definition JSON:

*   `_.merge` is a function from the Lodash library.
*   `deepmerge` is a standalone library used for object merging.

**Special JS Features or Syntax**

None are explicitly mentioned in this benchmark, but both libraries use ES6+ syntax and JavaScript's object destructuring feature (`{ ... } = ...;`) to simplify code readability.

Related benchmarks:

lodash merge vs deepmerge MR (version: 0)

Comparing performance of: lodash merge vs deepmerge

Created: 2 years ago by: Guest

Jump to the latest result

lodash merge

deepmerge

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):