Benchmark: Object.assign vs spread vs jQuery.extend vs property assignment

HTML Preparation code:

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };
jQuery.extend
var params = { b:"hello", c: true, d:7 }; var other = $.extend({ a: 2 }, params);
property assignment
var params = { b:"hello", c: true, d:7 }; params.a = 2;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator
jQuery.extend
property assignment

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what each test case is testing.

**Benchmark Overview**

The benchmark compares four different approaches to assign properties to an object:

1. `Object.assign()`
2. Spread operator (`...`)
3. `jQuery.extend()` (using jQuery library)
4. Property assignment using dot notation (`params.a = 2;`)

**Test Cases**

Each test case consists of a JavaScript code snippet that creates an object with some properties, and then attempts to assign new properties to it using one of the four approaches.

Here's a brief explanation of each test case:

1. **Object.assign()**: The code snippet creates an object `params` with three properties: `b`, `c`, and `d`. It then calls `Object.assign()` to create a new object `other` that contains all the properties from `params`.
2. **Spread operator (`...`)**: Similar to the first test case, but instead of using `Object.assign()`, it uses the spread operator (`...`) to create a new object with the same properties as `params`.
3. **jQuery.extend()**: This test case uses the jQuery library to extend an existing object (`{ a: 2 }`) with the properties from `params`. The `$.extend()` function is used to merge two objects.
4. **Property assignment using dot notation**: In this test case, the code simply assigns new properties to the `params` object using dot notation (`params.a = 2;`). There's no attempt to create a new object or modify an existing one.

**Options Compared**

The benchmark is comparing four different approaches to assign properties to an object:

* **Object.assign()**: A built-in JavaScript method for merging objects.
* **Spread operator (`...`)**: A syntax feature introduced in ECMAScript 2018 that allows for more concise object creation and assignment.
* **jQuery.extend()**: A function from the jQuery library that merges two objects together.
* **Property assignment using dot notation**: A simple, non-object-centric approach to assigning properties.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **Object.assign()**:
	* Pros: Fast, widely supported, and easy to use.
	* Cons: Can be slower than other approaches for large objects, and may not work well with older browsers that don't support it.
2. **Spread operator (`...`)**:
	* Pros: Concise, modern syntax, and works well with most JavaScript features.
	* Cons: May be less efficient than `Object.assign()` for very large objects, and requires ECMAScript 2018 support.
3. **jQuery.extend()**:
	* Pros: Widely supported by jQuery users, but may not be the best choice for non-jQuery projects.
	* Cons: Adds unnecessary overhead due to the use of a library function, and may not work well with other libraries that also use `$.extend()`.
4. **Property assignment using dot notation**:
	* Pros: Fast, lightweight, and easy to understand.
	* Cons: Not object-centric, which can make it harder to manage complex data structures.

**Library Usage**

The benchmark uses jQuery library in one of the test cases (`jQuery.extend()`). The library is used to provide a familiar API for extending objects, but may not be necessary for non-jQuery projects.

**Special JavaScript Features**

None of the test cases use any special JavaScript features beyond what's required by ECMAScript 2018.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser/OS: Chrome 71 on Mac OS X 10.14.2

View result in a separate tab

Test name	Executions per second
Object.assign	3969296.2 Ops/sec
spread operator	2152281.8 Ops/sec
jQuery.extend	2448167.8 Ops/sec
property assignment	752398912.0 Ops/sec

Related benchmarks:

Object.assign vs spread vs jQuery.extend vs property assignment (version: 0)

Comparing performance of: Object.assign vs spread operator vs jQuery.extend vs property assignment

Created: 5 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

jQuery.extend

property assignment

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):