Benchmark: parent vs closest 3

HTML Preparation code:

<span class="span">
  <div>
    <div id='it'>
    </div>
  </div>
</span>

Script Preparation code:

var it = document.getElementById("it");

Tests:

parentElement
while (it !== null && it.className.indexOf("span") === -1) { it = it.parentElement; }
closest tag
it.closest('span')
closest class
it.closest('.span')
closest tag class
it.closest('span.span')
parentNode
while (it.className.indexOf("span") === -1) { it = it.parentNode; if(it === document) { it = null break } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parentElement
closest tag
closest class
closest tag class
parentNode

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Windows

View result in a separate tab

Test name	Executions per second
parentElement	6140551.0 Ops/sec
closest tag	6394356.5 Ops/sec
closest class	6636166.0 Ops/sec
closest tag class	4850139.0 Ops/sec
parentNode	8278443.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested in each test case.

**Benchmark Definition**

The `BenchmarkDefinition` is a string that represents a JavaScript function or code snippet. This function will be executed repeatedly to measure its performance. In this case, we have five different benchmarks:

1. **`while (it !== null && it.className.indexOf(\"span\") === -1) {\r\n  it = it.parentElement;\r\n}`**: This loop finds the closest ancestor of an element with class `span`. It starts by checking if the current element is not null and does not have class `span`. If so, it moves up the DOM tree by setting `it` to its parent element.
2. **`it.closest('span')`**: This function returns the closest ancestor of the current element that has class `span`.
3. **`it.closest('.span')`**: Similar to the previous one, but uses a CSS selector (`'.span'`) instead of a DOM method.
4. **`it.closest('span.span')`**: Again, finds the closest ancestor with both classes `span` and another class (implied by the use of `'span.span'`).
5. **`while (it.className.indexOf(\"span\") === -1) {\r\n  it = it.parentNode;\r\n  if(it === document) {\r\n    it = null\r\n    break\r\n  }\r\n}`**: This loop finds the closest ancestor of an element with class `span`, but uses the `parentNode` property instead of `parentElement`.

**Library**

In all cases, a library or framework is used to manipulate the DOM (Document Object Model). The most commonly used one in this case appears to be jQuery, which provides methods like `.closest()`.

**Special JS features/syntax**

None are explicitly mentioned, but we can infer that some advanced JavaScript concepts are being tested:

* **Closure**: In benchmark 2 and 4, the `closest` function is used. This might involve closures, as it needs to capture the current element in its scope.
* **CSS selectors**: Benchmark 3 uses a CSS selector (`'.span'`) instead of a DOM method, which requires an understanding of CSS syntax and how it interacts with JavaScript.
* **DOM traversal**: Benchmarks 1 and 5 use `parentElement` or `parentNode` to traverse the DOM tree. This involves understanding how these properties work in different browsers.

**Pros and cons of each approach**

Here's a brief summary:

1. **`while (it !== null && it.className.indexOf(\"span\") === -1) {\r\n  it = it.parentElement;\r\n}`**: This loop uses the `parentElement` property, which is supported by most modern browsers. However, it may not be as efficient as using CSS selectors.
2. **`it.closest('span')`**: Uses a jQuery method, which provides a convenient way to find closest ancestors. However, this might introduce additional overhead due to the use of an external library.
3. **`it.closest('.span')`**: Similar to the previous one, but uses a CSS selector. This can be more efficient than using `parentElement`.
4. **`it.closest('span.span')`:** Uses another jQuery method, which requires understanding how CSS selectors work and how they interact with JavaScript.
5. **`while (it.className.indexOf(\"span\") === -1) {\r\n  it = it.parentNode;\r\n  if(it === document) {\r\n    it = null\r\n    break\r\n  }\r\n}`**: This loop uses the `parentNode` property, which is supported by all browsers. However, it may be less efficient than using CSS selectors.

**Other alternatives**

Some possible alternative approaches could include:

* Using a different library or framework for DOM manipulation (e.g., vanilla JavaScript instead of jQuery).
* Implementing custom CSS selector parsing to avoid relying on external libraries.
* Optimizing the loop in benchmark 1 to use a more efficient traversal method, such as using `stepChild` instead of `parentElement`.

Keep in mind that these alternatives would likely require significant changes to the original code and might not be suitable for all use cases.

Related benchmarks:

parent vs closest 3 (version: 0)

Comparing performance of: parentElement vs closest tag vs closest class vs closest tag class vs parentNode

Created: 4 years ago by: Guest

Jump to the latest result

parentElement

closest tag

closest class

closest tag class

parentNode

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):