Benchmark: fafafafaf - MeasureThat.net

HTML Preparation code:

<div class='x'></div>
<div class='x'></div>
<div class='x'></div>
<div class='x'></div>
<div></div>
<div class='x'></div>
<div></div>
<div class='x'></div>

Script Preparation code:

function getAll(elem, selector) {
  let nodeList;

  if (selector === undefined) {
    selector = elem;
    nodeList = document.querySelectorAll(selector);
  } else {
    nodeList = (elem).querySelectorAll(selector);
  }

  return Array.from(nodeList);
}

Tests:

asd
getAll('div:not(.x)') .forEach(line => line.parentNode.removeChild(line)); getAll('.x') .forEach(line => line.classList.remove('x'));
basd
getAll('div:not(.x)') .forEach(line => { if (line.classList.contains('x')) line.classList.remove('x'); else line.parentNode.removeChild(line); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
asd
basd

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

MeasureThat.net is used to create and run JavaScript microbenchmarks, which allows developers to measure the performance of different code snippets under various conditions.

The provided JSON represents two benchmark definitions:

1. **Script Preparation Code**: This section defines a custom function called `getAll` that takes an element (`elem`) and a selector (`selector`). The function returns an array of elements matching the selector using `document.querySelectorAll`. If no selector is provided, it defaults to the element itself.

The `getAll` function has two options compared:

*   **Option 1**: Uses the `.querySelectorAll()` method directly on the element.
*   **Option 2**: Uses a function call with `elem` as an argument and returns the result of `(elem).querySelectorAll(selector)`.

**Pros and Cons of Each Approach:**

*   **Option 1 (.querySelectorAll())**:
    *   Pros: More efficient, as it uses the browser's native querySelectorAll method.
    *   Cons: May not work in older browsers or those with outdated standards support.
*   **Option 2 (Function Call)**:
    *   Pros: Works across all browsers and versions that support JavaScript functions and `querySelector`.
    *   Cons: Less efficient than Option 1, as it involves an extra function call.

**Library Used**

The `getAll` function uses the `document.querySelectorAll` method to retrieve elements. This method is part of the HTML DOM API, which is supported by all modern browsers.

**Special JS Feature/Syntax**

Neither of the benchmark definitions utilizes any special JavaScript features or syntax that would require additional explanation.

**Alternatives**

If you want to measure the performance of different ways to get all child nodes of an element, you could consider the following alternatives:

*   Using `element.childNodes` instead of `document.querySelectorAll`.
*   Using a library like `querySelector-all-polyfill` for older browsers that don't support native querySelectorAll.
*   Creating a microbenchmark with other JavaScript engines or environments to ensure compatibility.

Keep in mind that MeasureThat.net is specifically designed for web development and browser-specific performance testing, so these alternatives might not be the best fit for this particular use case.

Related benchmarks:

fafafafaf (version: 0)

Comparing performance of: asd vs basd

Created: 6 years ago by: Guest

Jump to the latest result

asd

basd

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):