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Comparing performance of:
1 vs 2 vs 3
Created:
7 years ago
by:
Guest
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HTML Preparation code:
<p id="foo"> <span>hello</span> <div>world</div> </p>
Tests:
1
var node = document.querySelectorAll("#foo"); for (let i = 0; i < node.length; i++) { node[i].innerHTML = ''; }
2
var node = document.querySelectorAll("#foo"); for (let i = 0; i < node.length; i++) { node[i].parentNode.removeChild(node[i]); }
3
var node = document.querySelectorAll("#foo"); for (let i = 0; i < node.length; i++) { node[i].innerHTML = ''; node[i].parentNode.removeChild(node[i]); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
1
2
3
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the provided JSON data and explain what is being tested. **Benchmark Overview** The benchmark tests the performance of three different approaches to removing elements from an HTML document using JavaScript. **Test Cases** 1. **Clear innerHTML**: In this test case, a variable `node` is assigned the result of `document.querySelectorAll("#foo")`, which selects all elements with the ID "foo". Then, for each selected element, its `innerHTML` property is set to an empty string. This approach effectively clears the contents of the elements without removing them from the DOM. 2. **Remove child node**: In this test case, a variable `node` is assigned the result of `document.querySelectorAll("#foo")`, which selects all elements with the ID "foo". Then, for each selected element, its parent node (`parentNode`) is called with the `removeChild()` method to remove the element from the DOM. 3. **Combine clear innerHTML and remove child node**: In this test case, a variable `node` is assigned the result of `document.querySelectorAll("#foo")`, which selects all elements with the ID "foo". Then, for each selected element, its `innerHTML` property is set to an empty string (clearing the contents), followed by removing the element from the DOM using `parentNode.removeChild(node[i])`. **Library and Special JS Feature** No external libraries are used in this benchmark. The test cases only utilize built-in JavaScript methods and properties. **Test Preparation** The HTML preparation code creates a simple HTML document with an element having the ID "foo". This is the starting point for each test case. **Other Alternatives** Some possible alternatives to these approaches include: * Using `node[i].outerHTML = ''` instead of `node[i].innerHTML = ''`, which would also clear the contents, but might be slower due to the additional work done. * Using a library like jQuery to select and manipulate elements, which could potentially provide better performance due to its optimized DOM traversal and manipulation algorithms. However, this is not tested in these benchmark cases. **Pros and Cons of Each Approach** 1. **Clear innerHTML**: * Pros: Fast, as it only updates the element's contents without modifying its position in the DOM. * Cons: May leave empty elements in the DOM if not properly removed or cleared. 2. **Remove child node**: * Pros: Efficiently removes the elements from the DOM, potentially faster than clearing innerHTML and then removing the element. * Cons: Can be slower due to the overhead of `removeChild()` method calls. 3. **Combine clear innerHTML and remove child node**: * Pros: Offers a balance between speed and efficiency, as it clears contents quickly and then removes the elements from the DOM. * Cons: May incur some performance penalty due to the combined operations. These are general observations, and actual performance may vary depending on specific browser implementations and other factors.
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