Benchmark: filter vs find - MeasureThat.net

HTML Preparation code:

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

Script Preparation code:

var divs = [];
for(var x=0; x<20; x++){
   var $page= $('<div class="page page-'+x+'">');
   for(var i=0;i<50;i++){
      var $line= $('<div class="line line-'+((x*50)+i)+'">');
      for(var j=0; j<5; j++){
         var $item= $('<div class="item">');
         $line.append($item);
      }
      $page.append($line);
   }
   divs[divs.length] = $page[0];
}
$(document.body).append($(divs));

Tests:

Filter
var $line = $(document.body).children('.page').children('.line-'+50);
Find
var $line = $(document.body).find('.line-'+50);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Filter
Find

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested, the options being compared, their pros and cons, and other considerations.

**Benchmark Definition:**

The benchmark is comparing two approaches for finding an element within a document:

1. `var $line = $(document.body).children('.page').children('.line-'+50);`
2. `var $line = $(document.body).find('.line-'+50);`

These two lines of code are used to retrieve the first child element (`$line`) of the document body that has a class of "page" and contains an element with a class of "line-" followed by a number (in this case, 50).

**Script Preparation Code:**

The script preparation code generates a HTML document containing multiple pages with lines. Each line has five items. The generated HTML looks like this:
```html
<div class="page page-0">
  <div class="line line-0">
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
  </div>
</div>

<div class="line line-50">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>
```
**Html Preparation Code:**

The HTML preparation code includes a reference to the jQuery library, which is used to manipulate the DOM.

**Options being compared:**

There are two options being compared:

1. `children()`: This method returns all child elements of an element that match the specified selector.
2. `find()`: This method returns the first matching element within the document, based on the specified selector.

**Pros and Cons:**

* `children()`:
	+ Pros:
		- More efficient when working with a fixed set of elements, as it only needs to iterate over the child nodes once.
	+ Cons:
		- Can be slower when searching for an element that is far down in the DOM tree, as it needs to traverse the entire tree to find the match.
* `find()`: This method is more flexible and allows for searching within a larger document. However, it may be slower than `children()` due to the overhead of traversing the DOM.

**Other Considerations:**

* The benchmark assumes that the elements being searched have a unique class name (in this case, "line-" followed by a number). If multiple elements share the same class name, only the first one will be returned.
* The benchmark does not account for any potential CSS selectors or attribute filters that might be applied to the elements.

**Library:**

The `$(document.body)` object is an instance of jQuery, which provides a convenient way to manipulate the DOM. In this case, we're using it to access the document body and find the desired element.

**Special JS Feature/Syntax:**

There are no special JavaScript features or syntax used in this benchmark. The focus is on comparing the performance of two DOM manipulation methods.

Related benchmarks:

filter vs find (version: 0)

Comparing performance of: Filter vs Find

Created: 8 years ago by: Guest

Jump to the latest result

Filter

Find

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):