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not perf2
(version: 0)
Comparing performance of:
not css vs filter vs not js
Created:
6 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script> <div class="test"></div> <div class="test magic"></div>
Tests:
not css
$('.test:not(.magic)').length
filter
$('.test').filter(':not(.magic)').length
not js
$('.test').not('.magic').length
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
not css
filter
not js
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the benchmark and its various components, options, pros, cons, and considerations. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark that measures the performance of three different approaches to filter elements from a jQuery object: `.not()`, `.filter()`, and plain `.length` comparison. The test cases are designed to highlight the differences in execution speed between these methods. **Options Compared** 1. `$.('.test:not(.magic)').length`: This method uses the `not()` function provided by jQuery to exclude elements with the class `magic`. It's an efficient way to filter elements, as it only checks for the presence of a class and returns a boolean value. 2. `$('.test').filter(':not(.magic)').length`: This method uses the `.filter()` method, which applies a callback function to each element in the set and returns a new array with only the elements that pass the test. The `:not(.magic)` pseudo-class is used to exclude elements with the class `magic`. 3. `$('.test').not('.magic').length`: This method uses the `.not()` function provided by jQuery to exclude elements with the specified CSS selector. **Pros and Cons** 1. **`.not()`**: * Pros: Fast, efficient, and easy to read. * Cons: May not work as expected if the element is not present in the DOM or has multiple classes that need to be excluded. 2. **`.filter()`**: * Pros: More flexible than `.not()`, can handle complex filtering conditions, and works even if the element is not present in the DOM. * Cons: Slower than `.not()` due to the overhead of creating a new array and applying the callback function. 3. **Plain `.length` comparison**: * Pros: Fastest way to check for element presence, but may require multiple checks if the element has other classes or attributes that need to be excluded. * Cons: Not as readable or maintainable as the other two methods. **Library and Purpose** The provided JSON uses jQuery, a popular JavaScript library for DOM manipulation and event handling. The `.not()` method is part of jQuery's functionality, while the `.filter()` method is also a standard jQuery feature. The plain `.length` comparison does not rely on any additional libraries or frameworks. **Special JS Features/Syntax** There are no special JavaScript features or syntax used in this benchmark. However, it's worth noting that some older browsers may have different behavior when using certain methods like `.not()` and `.filter()`, so it's essential to test across various environments. **Other Alternatives** If you're looking for alternative approaches to filter elements, consider the following: * Using a plain JavaScript `Array.prototype.filter()` method instead of jQuery's `.filter()`. * Utilizing a library like Lodash or Ramda for more complex filtering conditions. * Implementing your own custom filtering logic using `forEach` and conditional statements. Keep in mind that each alternative approach has its pros and cons, and the choice ultimately depends on your specific use case, performance requirements, and personal preference.
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