Benchmark: lodash merge vs object.assign vs spread 22222

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

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The provided benchmark is designed to compare the performance of three approaches for merging objects: Lodash's `merge` function, `Object.assign()`, and the spread operator (`...`). The test cases are identical, except for the approach used to merge the objects. The goal is to determine which approach is the fastest.

**Options Compared**

The benchmark compares the following options:

1. **Lodash's `merge` function**: This is a popular utility function in Lodash that merges two or more objects into one. It returns a new object with the merged properties.
2. **`Object.assign()`**: This method takes an existing object and adds new properties to it, returning the modified object.
3. **Spread operator (`...`)**: This operator allows you to create a new object by spreading the properties of an existing object.

**Pros and Cons**

Here's a brief summary of each approach:

* **Lodash's `merge` function**:
	+ Pros: Efficiently handles nested objects, has some built-in optimizations.
	+ Cons: Requires Lodash library inclusion, might be overkill for simple use cases.
* **`Object.assign()`**:
	+ Pros: Simple and lightweight, works well with arrays and objects.
	+ Cons: Can lead to shallow copies if not used carefully, slower performance compared to spread operator.
* **Spread operator (`...`)**:
	+ Pros: Fast and efficient, no external library required.
	+ Cons: Requires modern JavaScript support (ES6+), might be less readable for complex merges.

**Library and Purpose**

The Lodash library is a popular collection of reusable functions for functional programming. In this case, the `merge` function is used to merge two or more objects into one.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in the benchmark code. All three approaches use standard JavaScript constructs and libraries (Lodash for `merge`, native `Object.assign()`).

**Other Alternatives**

If you're looking for alternatives, you might consider:

* **Fusion**: A modern JavaScript library that provides a more efficient merge function.
* **MergeDelegates**: A lightweight utility for merging objects in a single line of code.

Keep in mind that the spread operator (`...`) is not available in older browsers or Node.js versions. If you need to support those environments, one of the above alternatives might be necessary.

In summary, the benchmark compares three approaches for merging objects: Lodash's `merge` function, `Object.assign()`, and the spread operator (`...`). While each approach has its pros and cons, the spread operator is currently the fastest option with modern JavaScript support.

Related benchmarks:

lodash merge vs object.assign vs spread 22222 (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):