Benchmark: $.extend() recursivity performance test (Jquery 3.6.1)

HTML Preparation code:

<script src="https://code.jquery.com/jquery-3.6.1.min.js"></script>

Tests:

Without Recursivity
var obj1a = {"a": 1, "b": {"a": 1, "b": {"a": 1, "b": {"a": 1, "b": 1}}}} var obj2a = $.extend({}, obj1a)
With Recursivity
var obj1b = {"a": 1, "b": {"a": 1, "b": {"a": 1, "b": {"a": 1, "b": 1}}}} var obj2b = $.extend(true, {}, obj2b)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Without Recursivity
With Recursivity

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark is defined by a JSON object that provides metadata about the test, including:

* `Name`: A descriptive name for the benchmark, which includes the JavaScript method being tested (`$.extend()`) and its specific scenario (recursivity performance).
* `Description`: A brief summary of what the benchmark is testing.
* `Script Preparation Code` and `Html Preparation Code`: These are empty fields, indicating that the script and HTML required to run the test have been provided separately.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **Without Recursivity**: This test case creates an object (`obj1a`) with a deeply nested structure, and then uses `$.extend()` without any additional arguments (indicating no recursivity). The resulting object is stored in `obj2a`.
2. **With Recursivity**: This test case creates the same object structure as above (`obj1b`), but this time uses `$.extend()` with a third argument set to `true`, which enables recursivity. The resulting object is stored in `obj2b`.

**What's being tested**

In essence, these two test cases compare the performance of `$.extend()` when it's not needed (i.e., without recursivity) versus when it's necessary (with recursivity).

**Options compared**

The comparison between the two options involves:

* **Without Recursivity**: Using `$.extend()` without any additional arguments (i.e., with default behavior).
* **With Recursivity**: Using `$.extend()` with an additional argument set to `true`, which enables recursivity.

**Pros and Cons of each approach**

1. **Without Recursivity**:
	* Pros: Typically faster, as it doesn't incur the overhead of recursivity.
	* Cons: May not handle deeply nested structures efficiently if recursivity is required.
2. **With Recursivity**:
	* Pros: Can handle deeply nested structures without issues, but may be slower due to recursion overhead.
	* Cons: May consume more memory and CPU resources.

**Library: jQuery**

The `$.extend()` method is a part of the popular JavaScript library jQuery. Its primary purpose is to recursively merge multiple objects into one object, allowing you to easily clone or combine existing data structures.

In this benchmark, `$` refers to the jQuery global variable, which provides access to its functionality, including `$.extend()`.

**Special JS feature/Syntax**

There doesn't appear to be any special JavaScript features or syntax used in these test cases. The code is standard vanilla JavaScript, with jQuery being used as a library.

**Alternatives**

Other alternatives for creating deeply nested objects and merging multiple data structures could include:

* Using a recursive function without a library (e.g., writing your own `merge()` function).
* Employing an iterative approach to merge the objects (e.g., using a loop or `Array.prototype.reduce()`) instead of relying on recursion.
* Utilizing other libraries that provide similar functionality, such as Lodash or Underscore.js.

Keep in mind that these alternatives might have different performance characteristics and trade-offs compared to jQuery's `$` library.

Related benchmarks:

$.extend() recursivity performance test (Jquery 3.6.1) (version: 0)

Compare $.extend with and without recursivity when the recursivity isn't needed

Comparing performance of: Without Recursivity vs With Recursivity

Created: 3 years ago by: Guest

Jump to the latest result

Without Recursivity

With Recursivity

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):