Benchmark: _.merge vs destructuring

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>

Script Preparation code:

var o1 = {
    a: 1,
    b: 2,
    c: 3,
    d: 4,
    e: 5
};

var o2 = {
    f: 1,
    g: 2,
    h: 3,
    i: 4,
    j: 5
};

Tests:

_.merge
var result = _.merge(o1, o2)
ES6 destructuring
var result = { ...o1, ...o2 }

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

ES6 destructuring

7.4M/s

_.merge

3.5M/s

Fastest: ES6 destructuring (2.1x faster)

View exact numbers

✓ ES6 destructuring: 7,381,591 ops/sec
• _.merge: 3,500,752 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.merge
ES6 destructuring

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

ES6 destructuring

15.4M/s

_.merge

7.4M/s

View exact numbers

Test name	Executions per second
✓ ES6 destructuring	15,372,934 Ops/sec
_.merge	7,350,931 Ops/sec

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 data and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark consists of two test cases:

1. `_merge vs destructuring`: This test case compares the performance of Lodash's `merge` function versus a simple ES6 destructuring approach.
2. `ES6 destructuring`: This is an individual test case that measures the performance of a single JavaScript statement using ES6 destructuring.

**Options Compared**

The two options being compared are:

1. **Lodash's `merge` function**: A utility function provided by the Lodash library, which merges two objects into a new object.
2. **ES6 destructuring**: A syntax feature introduced in ECMAScript 2015 (ES6), which allows for more concise object merging.

**Pros and Cons**

1. **Lodash's `merge` function**:
	* Pros:
		+ Well-tested and widely supported library
		+ Provides a flexible and efficient way to merge objects
	* Cons:
		+ Adds an additional dependency (the Lodash library)
		+ May have slower performance due to the overhead of loading the library
2. **ES6 destructuring**:
	* Pros:
		+ Lightweight and doesn't add any dependencies
		+ Can be faster since it's a built-in feature
	* Cons:
		+ Requires support for ES6 syntax, which may not be present in older browsers or environments
		+ Can be less readable than the `merge` function

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, object merging, and more. The `merge` function is one of its most commonly used utility functions.

In this benchmark, Lodash's `merge` function is used to merge two objects, `o1` and `o2`. The performance comparison between the `merge` function and ES6 destructuring aims to answer the question: which approach is faster and more efficient?

**Special JS Feature or Syntax**

The benchmark uses the `...` syntax for destructuring, which is a feature introduced in ECMAScript 2015 (ES6). This syntax allows for spreading the properties of an object into another object.

Here's how it works:
```javascript
var result = { ...o1, ...o2 };
```
This line creates a new object `result` by merging the properties of `o1` and `o2`. The `...` operator spreads the properties of each object onto the resulting object.

**Other Alternatives**

Other alternatives for merging objects include:

* Using the spread operator (`{ ...o1, ...o2 }`)
* Using the `Object.assign()` method: `Object.assign({}, o1, o2)`
* Using a loop to iterate over the properties of each object and merge them manually

These alternatives may have varying performance characteristics depending on the specific use case.

In summary, this benchmark compares the performance of Lodash's `merge` function versus ES6 destructuring for merging two objects. The results will provide insight into which approach is faster and more efficient in terms of performance and execution time.

_.merge vs destructuring (version: 0) Benchmark.js

Comparing performance of: `_.merge vs ES6 destructuring`

Created: 5 years ago by: Guest

Go to the latest result

_.merge

ES6 destructuring

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

_.merge vs destructuring (version: 0) Benchmark.js

Comparing performance of: _.merge vs ES6 destructuring

Created: 5 years ago by: Guest

Go to the latest result

_.merge

ES6 destructuring

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `_.merge vs ES6 destructuring`