Benchmark: Object merge vs library merge Tomek

HTML Preparation code:

<script type='text/javascript' src='https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.min.js'></script>
<script type='text/javascript' src='https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js'></script>
<script type='text/javascript' src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<script type='text/javascript' src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.js'></script>

Tests:

Object.assign
var params = { a: "hello", b: true, c: 7 }; var other = Object.assign({}, { b: false, d: [ 1,2 ] }, params);
jQuery extend
var params = [1,2,3,4,5,6]; var other = $.extend({}, [7,8,9,10], params);
Immutable merge
var params = Immutable.fromJS([1,2,3,4,5,6]); var other = params.merge([7,8,9,10]);
Ramda merge
var params = [1,2,3,4,5,6]; var other = R.merge([7,8,9,10], params);
Spread operator
var params = [1,2,3,4,5,6]; var params2 = [7,8,9,10]; var output = [...params, ...params2]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
jQuery extend
Immutable merge
Ramda merge
Spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36

Browser/OS: Chrome 80 on Windows

View result in a separate tab

Test name	Executions per second
Object.assign	3375087.8 Ops/sec
jQuery extend	701133.6 Ops/sec
Immutable merge	973522.5 Ops/sec
Ramda merge	319820.2 Ops/sec
Spread operator	21337650.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided benchmark measures the performance of different methods to merge two arrays: `Object.assign()`, jQuery's `$.extend()`, Immutable.js' `merge()`, Ramda's `merge()`, and the spread operator (`...`).

**Options Compared**

Here are the options being compared:

1. **Object.assign()**: This is a built-in JavaScript method that merges one or more source objects into another object.
2. **jQuery extend**: This is a function from jQuery library that merges two objects together.
3. **Immutable merge**: This is a function from Immutable.js library that merges two immutable collections (in this case, arrays) together.
4. **Ramda merge**: This is a function from Ramda library that merges two values together.
5. **Spread operator (`...`)**: This is a new syntax in JavaScript that allows you to create a new array by spreading the elements of an existing array.

**Pros and Cons**

Here are some pros and cons for each option:

1. **Object.assign()**:
	* Pros: widely supported, easy to use.
	* Cons: can be slower than other options, may not handle complex data structures well.
2. **jQuery extend**:
	* Pros: part of a popular library, easy to use.
	* Cons: requires jQuery library, may have performance issues if not used carefully.
3. **Immutable merge**:
	* Pros: provides immutable collections, which can be beneficial for certain use cases (e.g., concurrent programming).
	* Cons: may be slower than other options due to its immutability guarantees.
4. **Ramda merge**:
	* Pros: part of a popular functional programming library, provides a concise way to merge values.
	* Cons: requires Ramda library, may not be familiar to non-functional programmers.
5. **Spread operator (`...`)**:
	* Pros: concise and expressive syntax, widely supported.
	* Cons: relatively new syntax, may require some familiarity with its usage.

**Libraries and Syntax**

Here's a brief introduction to the libraries mentioned:

1. **Immutable.js**: A library for working with immutable data structures (collections, maps, sets, etc.). It provides a way to create and manipulate these structures in a predictable and thread-safe manner.
2. **Ramda**: A functional programming library that provides a set of functions for working with collections (arrays, objects, etc.). Its `merge()` function is used in the benchmark.
3. **jQuery**: A popular JavaScript library that provides a way to simplify DOM manipulation and event handling.

The spread operator (`...`) is a new syntax introduced in ECMAScript 2015. It allows you to create a new array by spreading the elements of an existing array, or merge two arrays together using the `...` syntax (e.g., `[1,2,3,...,6]`).

**Other Alternatives**

If these options don't meet your needs, here are some alternative approaches:

1. **Loose assignment**: Using `=` to assign values from one object to another.
```javascript
var other = { b: false };
Object.assign(other, { d: [ 1,2 ] }, params);
```
This approach is simple but may not be as efficient as the options compared in the benchmark.

I hope this explanation helps you understand the JavaScript microbenchmark!

Related benchmarks:

Object merge vs library merge Tomek (version: 0)

Comparing performance of: Object.assign vs jQuery extend vs Immutable merge vs Ramda merge vs Spread operator

Created: 5 years ago by: Registered User

Jump to the latest result

Object.assign

jQuery extend

Immutable merge

Ramda merge

Spread operator

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):