Benchmark: Object merge vs library merge

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>

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 = { a: "hello", b: true, c: 7 }; var other = $.extend({}, { b: false, d: [ 1,2 ] }, params);
Immutable merge
var params = Immutable.fromJS({ a: "hello", b: true, c: 7 }); var other = params.merge({ b: false, d: [ 1,2 ] });
Ramda merge
var params = { a: "hello", b: true, c: 7 }; var other = R.merge({ b: false, d: [ 1,2 ] }, params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.17 Safari/537.36

Browser/OS: Chrome 81 on Mac OS X 10.15.3

View result in a separate tab

Test name	Executions per second
Object.assign	2941797.5 Ops/sec
jQuery extend	0.0 Ops/sec
Immutable merge	474616.5 Ops/sec
Ramda merge	2880476.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided benchmark.

The benchmark is comparing four approaches to merge two objects:

1. **Object.assign()**: This method creates a new object by copying all enumerable own properties from one or more source objects into a new object. The source objects are specified as an array of objects, and their properties are copied to the new object.
2. **jQuery.extend()**: Although jQuery is not explicitly mentioned in the benchmark definition, it's implied that this function is being tested since the "$.extend" string is used in the benchmark definition. jQuery.extend() does essentially the same thing as Object.assign(), but it's specifically designed for use with DOM elements and jQuery objects.
3. **Immutable.merge()**: This method takes two Immutable.js data structures (such as Maps, Sets, or Objects) and merges them into a new, immutable structure. In this benchmark, the "params" object is converted to an Immutable.js Object using `Immutable.fromJS()` before being merged with another object.
4. **Ramda.merge()**: This function takes two values as arguments and returns a new value that combines the key-value pairs of both input values into a single data structure (usually an object). The "params" object is passed directly to Ramda.merge(), without any conversions.

The pros and cons of each approach are:

* **Object.assign():**
	+ Pros: Simple, widely supported, and fast.
	+ Cons: It can create a new object with all the properties from both sources, which might be more memory-intensive than necessary. Additionally, it doesn't provide a clear way to handle conflicts between properties.
* **jQuery.extend()**:
	+ Pros: Easy to use, especially for developers familiar with jQuery.
	+ Cons: Not as widely supported as Object.assign(), and its behavior can be less predictable due to the complexities of DOM elements and event handling.
* **Immutable.merge():**
	+ Pros: Provides a clear way to handle conflicts between properties (by default, it will overwrite conflicting values from the first object).
	+ Cons: Can be slower than Object.assign() or jQuery.extend(), especially for large datasets. Additionally, Immutable.js is a separate library that needs to be included.
* **Ramda.merge():**
	+ Pros: Provides a simple and consistent way to merge data structures, with built-in support for handling conflicts between properties.
	+ Cons: Requires including the Ramda library, which might not be desirable in all projects.

When using these libraries, consider the following:

* If you need a simple, lightweight way to merge objects, Object.assign() or jQuery.extend() might be sufficient. However, if you want more control over conflicts and a consistent behavior across different data structures, Immutable.merge() or Ramda.merge() might be better choices.
* If you're already using jQuery in your project, using jQuery.extend() for merging objects can make sense due to its familiarity and ease of use.

Other alternatives that are not mentioned in the benchmark include:

* **Lodash.merge():** Similar to Ramda.merge(), but part of the Lodash library. It offers more features and a different API.
* **Underscore.js.merge():** Another utility library that provides a merge function, which can be used for merging objects.
* **ES6 spread operator (Object Spread Syntax):** A newer approach to merging objects using the syntax `{ ...a, ...b }`. While not as widely supported as Object.assign() or jQuery.extend(), it's gaining popularity and might become a standard in future JavaScript versions.

Related benchmarks:

Object merge vs library merge (version: 10)

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

Created: 6 years ago by: Registered User

Jump to the latest result

Object.assign

jQuery extend

Immutable merge

Ramda merge

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):