Benchmark: Object.assign jQuery.extend JSON V2

HTML Preparation code:

<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign(params);
JSON
var params = { b:"hello", c: true, d:7 }; var other = JSON.parse(JSON.stringify({ b:"hello", c: true, d:7 }));
jQuery.extend
var params = { b:"hello", c: true, d:7 }; var other = $.extend(true, params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
JSON
jQuery.extend

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark measures the performance of three functions: `Object.assign`, `JSON.parse(JSON.stringify)`, and `$.extend(true, obj)` (in this case, `$` refers to jQuery). These functions are used for object assignment or merging, which is a common operation in JavaScript.

**Options Compared**

The benchmark compares the performance of these three functions:

1.  **`Object.assign()`**: This function takes an object and one or more additional objects as arguments, and returns a new object containing all key-value pairs from the original object and the provided objects.
2.  **`JSON.parse(JSON.stringify(obj))`**: This function parses a JSON string into a JavaScript object. However, using `JSON.parse()` with `JSON.stringify(obj)` is not the most efficient way to merge two objects because it creates a new object each time and then recursively calls itself for each property in the object.
3.  **`.extend(true, obj)`**: This function is part of the jQuery library (specifically, `.extend()` function) that merges multiple objects into one. The `true` parameter indicates that the function should merge all properties from the source object(s) into the target object.

**Pros and Cons**

*   **`Object.assign()`**:
    *   Pros: Simple to use, fast, and widely supported.
    *   Cons: Not available in older browsers (pre-IE 10), may not work as expected with non-object properties.
*   **`JSON.parse(JSON.stringify(obj))`**:
    *   Pros: Widely supported, can be used for serialization and deserialization of objects.
    *   Cons: Inefficient due to the recursive call, not recommended for large objects or complex data structures.
*   **`.extend(true, obj)`** (jQuery):
    *   Pros: Fast, handles nested objects, and supports deep merge operations. Suitable for most use cases with jQuery.
    *   Cons: Requires a separate library (jQuery), slower than plain `Object.assign()` due to the additional overhead.

**Special JavaScript Feature/Syntax**

The benchmark uses the `$` symbol to reference jQuery's `extend()` function, which is not a standard JavaScript feature but part of the jQuery library. This allows users who have jQuery included in their project to use this function without having to include it manually.

**Other Alternatives**

Alternative methods for object assignment or merging in JavaScript include:

*   **`.merge()`**: A function from the `lodash` library that provides a fast and efficient way to merge objects.
*   **`.assignIn()`**: A method of the Lodash library (specifically, the `assignIn()` function) that allows you to assign properties from one object to another in a deep, recursive manner.

Note: These alternatives require including additional libraries (Lodash or jQuery), which may not be desirable for all projects.

Related benchmarks:

Object.assign jQuery.extend JSON V2 (version: 0)

Comparing performance of: Object.assign vs JSON vs jQuery.extend

Created: 5 years ago by: Guest

Jump to the latest result

Object.assign

JSON

jQuery.extend

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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