Benchmark: Array Properties Merge: Lodash merge vs Object.assign

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:


var arr = [{a: 1}, {b: 2}, {c: 3}];

Tests:

Lodash merge
_.merge({}, ...arr);
Object assign
Object.assign({}, ...arr)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash merge
Object assign

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches to merge an array of objects into a single object:

1. **Lodash `_.merge()`**: A popular JavaScript utility library that provides functions for common tasks, including merging objects.
2. **`Object.assign()`**: A built-in JavaScript method for cloning and merging objects.

**Test Cases**

There are only two test cases in this benchmark:

1. **Lodash merge (`_.merge()`)**: This test case uses the `_.merge()` function from Lodash to merge an array of objects into a single object.
2. **Object assign (`Object.assign()`)**: This test case uses the built-in `Object.assign()` method to achieve the same result as the Lodash `_.merge()` function.

**Library and Syntax**

The benchmark includes the Lodash library, which is a JavaScript utility library that provides functions for common tasks, including merging objects. The `_.merge()` function is used in one of the test cases.

No special JavaScript features or syntax are mentioned in this benchmark.

**Performance Comparison**

The performance comparison aims to measure which approach is faster:

* **Lodash merge (`_.merge()`) vs Object assign (`Object.assign()`)**

**Pros and Cons**

Here's a brief summary of each approach:

* **Lodash merge (`_.merge()`)**:
	+ Pros:
		- Highly optimized for performance.
		- Can handle complex object merges with ease.
		- Provides additional features like merging arrays and objects with defaults.
	+ Cons:
		- Requires including the Lodash library, which may not be desirable in all cases.
		- May have a higher memory overhead due to the additional library code.
* **Object assign (`Object.assign()`)**
	+ Pros:
		- Built-in method, so no additional library is required.
		- Simple and lightweight implementation.
	+ Cons:
		- May not be as optimized for performance as Lodash's `_.merge()` function.
		- Limited to simple object merges; more complex merges may require additional workarounds.

**Other Alternatives**

If you don't want to use the Lodash library or prefer a different approach, you could consider:

* **Using the `reduce()` method**: You can use the `reduce()` method to merge an array of objects into a single object. This approach is lightweight and doesn't require any additional libraries.
```javascript
arr.reduce((acc, curr) => Object.assign(acc, curr), {});
```
* **Implementing your own merge function**: You could write your own custom function for merging objects, which might be more optimized for performance or tailored to specific use cases.

Keep in mind that these alternatives may not offer the same level of performance as Lodash's `_.merge()` function or the built-in `Object.assign()` method.

Related benchmarks:

Array Properties Merge: Lodash merge vs Object.assign (version: 0)

Comparing performance of: Lodash merge vs Object assign

Created: 6 years ago by: Guest

Jump to the latest result

Lodash merge

Object assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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