Benchmark: lodash merge vs object.assign vs spreadaaa

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(a, b);
spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.assign(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
object.assign
spread

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations.

**What is being tested?**

The test case compares three approaches for merging two objects in JavaScript:

1. `_.merge(a, b)` from the Lodash library
2. `Object.assign()` method
3. Spread syntax (`a = { ... }`)

**Options compared:**

* **Lodash merge**: Uses the `_merge()` function to combine two objects.
	+ Pros:
		- Can handle nested objects and arrays.
		- Supports merging multiple objects.
	+ Cons:
		- Requires including an additional library (Lodash).
		- May have a higher overhead due to the additional dependency.
* **Object.assign()**: A built-in method for assigning properties from one object to another.
	+ Pros:
		- Built-in and widely supported, reducing dependencies.
		- Fast and efficient.
	+ Cons:
		- Limited to assigning basic properties (no nested objects or arrays).
		- Can lead to unexpected behavior if not used carefully.
* **Spread syntax**: A shorthand way of creating a new object by spreading the properties of an existing object.
	+ Pros:
		- Fast and efficient.
		- Easy to read and understand.
	+ Cons:
		- Limited to assigning basic properties (no nested objects or arrays).
		- May not be as flexible as `Object.assign()`.

**Library:**

In the provided benchmark, Lodash is used. Lodash is a popular JavaScript library that provides utility functions for various tasks, including data manipulation, string manipulation, and more. The `_merge()` function in particular allows for merging objects by recursively combining their properties.

**Special JS feature or syntax:**

The spread syntax (`a = { ... }`) is being tested as part of the `Object.assign()` method.

**Other considerations:**

* **Browser support:** The benchmark results are from Chrome 99 on a Mac OS X 10.15.7 system, which means that only this browser and operating system combination is being tested.
* **Device platform:** The test is running on a desktop device, which might not be representative of all devices (e.g., mobile or tablet).
* **Testing framework:** MeasureThat.net seems to use an internal testing framework, which might introduce additional overhead or limitations.

**Alternatives:**

Other alternatives for merging objects in JavaScript could include:

* Using the `merge()` function from a different library, such as `lodash-es` (ES module version of Lodash).
* Implementing a custom merge function using recursion and conditional statements.
* Using a third-party library that provides a more comprehensive merge functionality, such as `immer`.

Keep in mind that these alternatives might have their own trade-offs in terms of performance, readability, and maintenance.

Related benchmarks:

lodash merge vs object.assign vs spreadaaa (version: 0)

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

Created: 4 years ago by: Guest

Jump to the latest result

lodash merge

object.assign

spread

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):