Benchmark: TreeWalker for loop -> vs querySelectorAll (* ) ->

HTML Preparation code:

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Tests:

TreeWalker
const treeWalker = document.createTreeWalker( document.body, NodeFilter.SHOW_ELEMENT ); const list = []; for(let element; element; element = treeWalker.nextNode()) { element.className = 'new Class' }
querySelectorAll
const list = document.body.querySelectorAll('*'); for(let i = 0, len = list.length ; i < len ; i++){ list[i].className = 'new Class' }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
TreeWalker
querySelectorAll

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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**Benchmark Overview**

The provided benchmark measures the performance of two approaches to modify elements in HTML documents: using a `TreeWalker` and using `querySelectorAll`. The benchmark aims to determine which approach is faster.

**TreeWalker Approach**

The TreeWalker approach uses the `createTreeWalker()` method to traverse the DOM tree. A `NodeFilter.SHOW_ELEMENT` filter is used to only consider element nodes. In each iteration, the next node is retrieved using the `nextNode()` method and its class name is modified to "new Class".

**querySelectorAll Approach**

The `querySelectorAll('*')` approach uses a CSS selector to select all elements in the document. The selected elements are then iterated over, and their class names are modified to "new Class" using a `for` loop.

**Comparison of Approaches**

Here's a comparison of the two approaches:

*   **TreeWalker Approach**
    *   Pros:
        *   More explicit control over the traversal order
        *   Can be more efficient for modifying elements in a specific order
    *   Cons:
        *   May require more setup and configuration
        *   Can be slower for very large documents due to the overhead of creating a TreeWalker instance
*   **querySelectorAll Approach**
    *   Pros:
        *   Generally faster than the TreeWalker approach, especially for large documents
        *   More concise and easier to read code
    *   Cons:
        *   Less control over the traversal order
        *   May modify elements in a different order than intended

**Library Usage**

The `TreeWalker` approach uses the `document.createTreeWalker()` method, which is part of the DOM API. This method creates a new instance of a TreeWalker object, which traverses the DOM tree according to the specified filter.

**Special JS Features**

None are mentioned in the provided code or benchmark results.

**Alternatives**

Other alternatives for modifying elements in HTML documents include:

*   **getElementsByClassName()**: A DOM method that returns an array of elements with a specific class name. It can be used as an alternative to `querySelectorAll`, but it may have performance issues for very large documents.
*   **CSS Selectors**: CSS selectors can be used to select elements based on various attributes, classes, or IDs. However, they may not provide the same level of control as the TreeWalker approach.

**Other Considerations**

When choosing an approach, consider factors such as:

*   Document size: For very large documents, the `querySelectorAll` approach may be faster due to its optimized implementation.
*   Element modification order: If a specific order is required, the TreeWalker approach may provide more control.
*   Code readability and conciseness: The `querySelectorAll` approach can result in more concise code.

Overall, the choice between the TreeWalker and `querySelectorAll` approaches depends on the specific requirements of your project.

Related benchmarks:

TreeWalker for loop -> vs querySelectorAll (* ) -> (version: 0)

Comparing performance of: TreeWalker vs querySelectorAll

Created: 4 years ago by: Guest

Jump to the latest result

TreeWalker

querySelectorAll

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):