Benchmark: Compare the new ES6 spread operator with Ramda assoc (10000000 keys)

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 };
for(var i = 0; i<10000000; i++);
params['x'+i] = i

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Ramda assoc
Object.assign

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/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spread operator	64261044.0 Ops/sec
Ramda assoc	21495346.0 Ops/sec
Object.assign	19850704.0 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 and explain what is being tested, compared, and some pros and cons of different approaches.

**Benchmark Overview**

The benchmark measures the performance of three methods to merge an object with a new set of key-value pairs:

1. ES6 spread operator (`{ ...params, "c": 3 }`)
2. Ramda's `assoc` function (`R.assoc("c", 3, params)`)
3. `Object.assign()` method (`Object.assign({}, params, { c: 3 })`)

**Script Preparation Code**

The script preparation code creates a large object with 10 million keys and a single value (`params = { "a": 1, "b": 2 }`). Then, it iterates from 0 to 9,999,999, assigning each iteration number to a new property on the `params` object.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads Ramda version 0.25.0, which is used in one of the benchmark test cases.

**Individual Test Cases**

Each test case has a specific `Benchmark Definition` code that creates a new object by merging the original `params` object with a new set of key-value pairs using the corresponding method:

1. Spread operator: `{ ...params, "c": 3 }`
2. Ramda's `assoc`: `R.assoc("c", 3, params)`
3. `Object.assign()` method: `Object.assign({}, params, { c: 3 })`

**Library: Ramda**

Ramda is a functional programming library for JavaScript that provides a set of utility functions for working with arrays and objects. In this benchmark, Ramda's `assoc` function is used to merge the original object with a new key-value pair.

Pros:

* Easy to read and write
* Does not modify the original object
* Can be composed with other functions

Cons:

* Slower than native JavaScript methods (e.g., spread operator, `Object.assign()`)
* Requires additional setup with Ramda library

**Other Alternatives**

1. **Native JavaScript spread operator**: `{ ...params, "c": 3 }` is a built-in JavaScript feature that allows merging objects using the spread operator.
Pros:

* Fast and efficient
* Native support in most browsers
Cons:

* Introduced in ECMAScript 2018 (ES2018)
2. **Object.assign() method**: `Object.assign()` is a built-in JavaScript method for merging objects.
Pros:

* Fast and efficient
* Wide browser support
Cons:

* May modify the original object if not used carefully

**Special JS Feature/ Syntax**

None mentioned in this benchmark.

**Additional Considerations**

When working with large datasets or performance-critical code, it's essential to consider the following factors:

1. **Browser version and compatibility**: Ensure that the chosen method works across different browsers and versions.
2. **Performance overhead**: Optimize code for performance by avoiding unnecessary functions calls or computations.
3. **Code readability**: Use clear and concise variable names, and avoid complex logic when merging objects.

In conclusion, this benchmark compares the performance of three methods to merge an object with a new set of key-value pairs: ES6 spread operator, Ramda's `assoc` function, and `Object.assign()` method. The choice of method depends on personal preference, project requirements, and the need for compatibility across different browsers and versions.

Related benchmarks:

Compare the new ES6 spread operator with Ramda assoc (10000000 keys) (version: 0)

Comparing performance of: spread operator vs Ramda assoc vs Object.assign

Created: 4 years ago by: Guest

Jump to the latest result

spread operator

Ramda assoc

Object.assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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