Benchmark: Compare the new ES6 spread operator with Ramda assoc

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.js"></script>

Script Preparation code:

var params = { "a": 1, "b": 2 };

Tests:

spread operator
var result = { ...params, "c": 3 };
Ramda assoc
var result = R.assoc("c", 3, params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Ramda assoc

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
spread operator	65856804.0 Ops/sec
Ramda assoc	28290578.0 Ops/sec

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the details of this benchmark test.

**What is being tested?**

This benchmark compares two different approaches to adding a new property (`c`) to an existing object (`params`):

1. Using the ES6 spread operator (`{ ...params, "c": 3 }`)
2. Using the Ramda library's `assoc` function (`R.assoc("c", 3, params)`)

**What are the pros/cons of these approaches?**

Both methods achieve the same result: adding a new property to an object. However, they differ in their performance and usage characteristics:

### Spread Operator

* **Pros**:
	+ Easy to read and write, especially for developers familiar with JavaScript's syntax.
	+ No external library dependencies.
* **Cons**:
	+ Can be slower than using a dedicated library like Ramda, as it involves more overhead (creating a new object, copying properties, etc.).
	+ May not be suitable for large or complex objects.

### Ramda `assoc` function

* **Pros**:
	+ Often faster and more efficient than the spread operator, especially for larger objects.
	+ Provides a dedicated function for modifying objects in a functional programming style.
* **Cons**:
	+ Requires including an external library (Ramda) in your project.
	+ May be less intuitive or familiar to developers without prior experience with Ramda.

**Other considerations**

When choosing between these approaches, consider the following:

* **Performance-critical code**: If you're working on a performance-sensitive section of your application, using the spread operator might not be the best choice. In that case, Ramda's `assoc` function could provide better results.
* **Code readability and maintainability**: If readability and maintainability are top priorities, the spread operator is likely a better fit.
* **Library dependencies**: If you're already using Ramda in your project for other purposes, it might make sense to stick with the `assoc` function for consistency.

**What library is used?**

The test uses the Ramda library (version 0.25.0), which provides various utility functions for working with data structures, including `assoc`.

**Special JavaScript feature or syntax used?**

Yes, this benchmark uses the ES6 spread operator (`{ ...params }`) and also assumes familiarity with JavaScript's object literal syntax.

**Alternatives**

If you're looking for alternative approaches to adding a new property to an existing object, consider these options:

* **Using the `Object.assign()` method**: This approach is similar to the spread operator but uses the `assign` function instead.
* **Merging objects manually**: You can also create a new object by merging the original with the new properties using a simple `return { ...original, ...newProperties }` syntax. However, this might be less efficient and harder to read than using the spread operator or Ramda's `assoc`.

I hope this explanation helps you understand the nuances of this benchmark test!

Related benchmarks:

Compare the new ES6 spread operator with Ramda assoc (version: 0)

Comparing performance of: spread operator vs Ramda assoc

Created: 8 years ago by: Guest

Jump to the latest result

spread operator

Ramda assoc

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):