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Complex find and select
(version: 0)
Comparing performance of:
complex select vs complex find vs Complex find cached vs complex find scoped
Created:
9 years ago
by:
Guest
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HTML Preparation code:
<div class="container"> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> <div class="sub"> foobar </div> </div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"> </script> <script> var container = $('#container') </script>
Tests:
complex select
$('.container .sub');
complex find
$('.sub', '.container');
Complex find cached
container.find('.sub');
complex find scoped
$('.sub', container).length;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
complex select
complex find
Complex find cached
complex find scoped
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided JSON data. **Benchmark Definition** The `benchmark definition` is a JavaScript expression that describes what operation is to be performed on the HTML document. There are four different definitions: 1. **`.('.container .sub')`**: This selects all elements with both classes `container` and `sub`. 2. **`.('.sub', '.container')`**: This selects all elements with class `sub`, regardless of whether they also have class `container`. 3. **`container.find('.sub')`**: This searches for elements with class `sub` within the `container` element. 4. **`.('.sub', container).length`**: This selects all elements with class `sub` that are descendants of the `container` element, and then returns the length of the resulting set. **Options compared** The four benchmark definitions test different aspects of how JavaScript selects and finds elements in an HTML document: * `.('.container .sub')` tests the performance of selecting multiple classes on a single element. * `.('.sub', '.container')` tests the performance of using `closest()` or similar method to find elements with one class within another. * `container.find('.sub')` tests the performance of searching for elements within a container element. * `.('.sub', container).length` tests the performance of selecting and counting descendant elements. **Pros and cons** Each approach has its advantages and disadvantages: * Selecting multiple classes on a single element (`'.container .sub'`) is generally more efficient, as it avoids unnecessary DOM lookups. However, if the HTML structure is complex or contains many duplicate classes, this method may not be optimal. * Using `closest()` or similar methods (`'.sub', '.container')` can be useful when working with legacy code that uses these APIs, but they may be slower than native CSS selectors. * Searching for elements within a container element (`container.find('.sub')`) is often used in jQuery-like libraries, but it can lead to slower performance compared to native CSS selectors. * Counting descendant elements (`'.sub', container).length` is useful when you need to know the number of matching elements, but it may be slower than using `find()` or `querySelectorAll()`. **Library usage** The `benchmark definition` uses jQuery's `$()` function to select elements. The test code uses jQuery's `.find()` method to search for elements within a container element. **Special JavaScript features or syntax** None of the benchmark definitions use any special JavaScript features or syntax, such as ES6 classes, async/await, or modern web APIs. **Alternatives** Other alternatives for measuring performance in JavaScript include: * V8 Profiler (Chrome DevTools) * Chrome Perfometer * Node.js Inspector * WebPageTest These tools can provide more detailed information about the performance characteristics of your code and help you identify bottlenecks.
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