Benchmark: lodash merge vs lodash defaults

HTML Preparation code:

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

Tests:

lodash merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge({}, a, b);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign({}, b, a);

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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Let's break down the provided JSON data and explain what is being tested.

**Benchmark Definition**

The benchmark definition represents a JavaScript microbenchmark that measures the performance of two different approaches: `lodash.merge` and `Object.assign`.

**Options Compared**

Two options are compared:

1. **_lodash.merge**: The first option uses the `_lodash.merge()` function from the Lodash library to merge two objects, `a` and `b`, into a new object.
2. **Object.assign():** The second option uses the built-in `Object.assign()` method to merge two objects, `b` and `a`.

**Pros and Cons of Each Approach**

1. **_lodash.merge()**
	* Pros:
		+ More intuitive API for merging objects
		+ Can handle more complex merging scenarios (e.g., array merger)
	* Cons:
		+ Adds an additional dependency on the Lodash library
		+ May have slower performance due to the added overhead of a function call and argument processing
2. **Object.assign()**
	* Pros:
		+ Built-in method, no additional dependencies required
		+ Can be faster since it's a built-in method with native execution
	* Cons:
		+ Less intuitive API for merging objects
		+ May not handle all edge cases (e.g., array merger)

**Library and Its Purpose**

The Lodash library is a popular utility belt for JavaScript that provides various helper functions, including `merge()`. The `_.merge()` function takes two or more objects as arguments and returns a new object with the merged properties.

**Test Case Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark. Both test cases use standard JavaScript syntax for merging objects.

**Other Alternatives**

If you prefer not to use Lodash, you can also consider using other library functions or native methods for merging objects, such as:

* `_object.assign()` (not built-in in all browsers) or
* `merge()` from the `ramda` library

Keep in mind that the performance difference between these approaches may be negligible in most cases. However, if you're working with large datasets or require high-performance data processing, using optimized methods like native `Object.assign()` or specialized libraries like Lodash or Ramda can provide significant benefits.

In summary, this benchmark compares the performance of two common ways to merge objects in JavaScript: `_lodash.merge()` and `Object.assign()`. While both approaches have their pros and cons, the choice ultimately depends on your specific use case, personal preference, and the trade-offs between ease of use, performance, and dependencies.

Related benchmarks:

lodash merge vs lodash defaults (version: 0)

Comparing performance of: lodash merge vs object.assign

Created: 5 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):