Benchmark: Ramda mergeRight vs spread

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/ramda/0.28.0/ramda.min.js'></script>

Tests:

Spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = { ...a, ...b };
Ramda mergeRight
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = R.mergeRight(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Ramda mergeRight

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Linux

View result in a separate tab

Test name	Executions per second
Spread	12852269.0 Ops/sec
Ramda mergeRight	3270755.8 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided benchmark.

The benchmark is comparing two approaches: using the spread operator (`...`) and using the `mergeRight` function from the Ramda library to merge two objects.

**Using the spread operator (`...`):**

This approach involves creating a new object by spreading the properties of one or more source objects into it. The syntax looks like this:
```javascript
var c = { ...a, ...b };
```
The pros of using the spread operator are:

* It's concise and easy to read.
* It works with any type of object that supports spreads (i.e., most JavaScript objects).

However, there are some potential downsides:

* The spread operator is only available in ECMAScript 2015 (ES6) and later versions. If you're targeting an older browser or environment, you may need to use a polyfill or alternative method.
* Using the spread operator can lead to slower performance compared to other methods, especially for large objects.

**Using `mergeRight` from Ramda:**

The `mergeRight` function is part of the Ramda library and allows you to merge two objects into a new object, with the second object's properties overriding the first object's properties. The syntax looks like this:
```javascript
var c = R.mergeRight(a, b);
```
The pros of using `mergeRight` are:

* It provides more control over the merging process, as you can specify which properties to override.
* It works with any type of object that supports Ramda's merge functions.

However, there are some potential downsides:

* The library is external and needs to be included in your script (as shown in the benchmark code).
* Using `mergeRight` may require more boilerplate code compared to using the spread operator.

**Other alternatives:**

There are other ways to merge objects in JavaScript, such as using `Object.assign()` or a custom implementation. However, these methods may not provide the same level of conciseness and ease-of-use as the spread operator or `mergeRight` from Ramda.

In terms of special JavaScript features or syntax, there isn't anything that stands out here. The benchmark is focused on comparing two specific approaches to merging objects.

Related benchmarks:

Ramda mergeRight vs spread (version: 0)

Comparing performance of: Spread vs Ramda mergeRight

Created: 2 years ago by: Guest

Jump to the latest result

Spread

Ramda mergeRight

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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