Benchmark: parent vs closest 1

HTML Preparation code:

<span class="span">
  <div>
    <div id='it'>
    </div>
  </div>
</span>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>

Script Preparation code:

var $it = $('#it');

Tests:

parent
$it.parent().parent()
closest tag
$it.closest('span')
closest class
$it.closest('.span')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parent
closest tag
closest class

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser/OS: Chrome 89 on Windows

View result in a separate tab

Test name	Executions per second
parent	604989.6 Ops/sec
closest tag	282358.3 Ops/sec
closest class	261137.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial for optimizing code and ensuring it runs efficiently across different browsers and environments.

The provided benchmark definition json represents a microbenchmark that tests the performance of two methods in jQuery: `parent()` and `closest()`. Specifically, it measures the execution time of these methods when applied to an element with the ID "it" within a `<span>` element.

**Options Compared**

Two approaches are compared:

1.  **Using `.parent().parent()`**: This approach traverses up the DOM tree twice, first from the immediate parent and then from the next level up.
2.  **Using `.closest('span')`**: This approach searches for a descendant with the exact ID "span" within the current element.
3.  **Using `.closest('.span')`**: This approach searches for an ancestor with the class name ".span".

**Pros and Cons of Each Approach**

1.  **`.parent().parent()`**
    *   Pros:
        *   Unambiguous: Clearly specifies two levels up in the DOM tree.
        *   Simple to read and understand.
    *   Cons:
        *   May perform unnecessary traversals, especially if there are multiple elements with the same ID.
        *   Less efficient due to duplicate searches.
2.  **`.closest('span')`**
    *   Pros:
        *   Efficient: Only searches for a descendant with the exact ID "span".
        *   Fast and lightweight.
    *   Cons:
        *   May not work as expected if there are multiple elements with the same ID but different parents.
        *   Less readable than `.parent().parent()`.
3.  **`.closest('.span')`**
    *   Pros:
        *   Flexible: Works even if the target element has a class name other than ".span".
        *   Robustness is comparable to using ` closest('span')`
    *   Cons:
        *   Less efficient than using `.closest()` with an ID due to the overhead of searching for classes.

**Library and Purpose**

In this benchmark, jQuery is used as the library. It's a popular JavaScript library that provides a simplified way to interact with the DOM tree, making it easier to write cross-browser compatible code.

**Special JS Feature or Syntax**

There are no special features or syntax mentioned in the provided benchmark definition json. However, note that using `closest()` and `parent()` can be affected by browser-specific behavior or quirks.

**Other Alternatives**

Other alternatives for these methods include:

*   Using `querySelectorAll()` instead of `.closest()`
*   Implementing a custom algorithm to find parents or closest elements
*   Utilizing libraries like DOM manipulation engines (e.g., `jsdom`)

Related benchmarks:

parent vs closest 1 (version: 0)

Comparing performance of: parent vs closest tag vs closest class

Created: 3 years ago by: Guest

Jump to the latest result

parent

closest tag

closest class

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):