Benchmark: lodash merge vs object.assign vs spread bis

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

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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 benchmark and its test cases.

**Overview of what's being tested:**

The benchmark is testing three different approaches for merging two objects in JavaScript:

1. Using the `_.merge()` function from the Lodash library.
2. Using the `Object.assign()` method.
3. Using the spread operator (`{ ...a, ...b }`).

These approaches are compared to determine which one performs the best in terms of speed.

**Options being compared:**

* `_.` is a reference to the Lodash library, which provides a set of useful functions for functional programming tasks, including merging objects.
* `Object.assign()` is a built-in method that copies properties from an object into another object.
* The spread operator (`{ ...a, ...b }`) is a feature introduced in ECMAScript 2018, which allows creating a new object by spreading the properties of two existing objects.

**Pros and Cons:**

1. **Lodash merge (`_.merge()`):**
	* Pros:
		+ Well-tested and widely used.
		+ Can handle more complex merging scenarios than `Object.assign()`.
	* Cons:
		+ Adds an external dependency (the Lodash library).
		+ May be slower due to the overhead of loading the library.
2. **`Object.assign()`:**
	* Pros:
		+ Built-in, so no extra dependencies are needed.
		+ Fast and efficient, as it's a native method.
	* Cons:
		+ Limited flexibility compared to `_.merge()`.
		+ May not handle complex merging scenarios well.
3. **Spread operator (`{ ...a, ...b }`):**
	* Pros:
		+ Built-in, so no extra dependencies are needed.
		+ Fast and efficient, as it's a native method.
		+ Flexible and easy to use for simple merges.
	* Cons:
		+ Limited support in older browsers or Node.js versions (requires ECMAScript 2018).
		+ May not be suitable for more complex merging scenarios.

**Library:**

The Lodash library is being used as a reference for the `_.merge()` function. It provides a set of utility functions, including `merge`, that can handle various types of data merge operations. In this case, it's being used to perform the merge operation between two objects (`a` and `b`) in each test case.

**Special JS feature or syntax:**

There are no special JavaScript features or syntaxes mentioned in this benchmark. All three approaches use standard JavaScript features (`.merge()` from Lodash, `Object.assign()`, and spread operator).

**Other alternatives:**

If you want to explore alternative approaches for merging objects in JavaScript, here are a few options:

* Using a library like `lodash` without the merge function, which can be slower but may offer more control over the merge process.
* Using a recursive approach with loops to combine the properties of two objects.
* Using a JSON merge library like `jsonmerge` or `fast-json-merge`.
* Implementing your own custom merge function.

Keep in mind that these alternatives might not be as efficient or convenient as using one of the built-in methods (`Object.assign()` or spread operator) or Lodash's `_.merge()`.

Related benchmarks:

lodash merge vs object.assign vs spread bis (version: 0)

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

Created: 3 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):