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id vs class test
(version: 0)
Comparing performance of:
id vs class
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<div id="1" class="2"> <span>some text</span> </div>
Tests:
id
const value = document.getElementById("1").innerHtml;
class
const value = document.getElementsByClassName("2")[0].innerHtml;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
id
class
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **What is being tested?** The provided benchmark tests two approaches to retrieve inner HTML content from an HTML element: using `document.getElementById` with an ID, and using `document.getElementsByClassName` with a class. **Options compared:** 1. **`document.getElementById`**: This method retrieves the first element that matches the specified ID. In this case, it's used to get the `<div>` element with ID "1". 2. **`document.getElementsByClassName`**: This method returns an HTMLCollection of all elements that match the specified class. Here, it's used to get the `<span>` element within the `<div>` with class "2". **Pros and Cons:** * `document.getElementById`: + Pros: Fast, efficient, and widely supported. + Cons: May not return any elements if no matching element is found (returns null), which can lead to errors if not checked for. Also, it's less flexible than `getElementsByClassName`. * `document.getElementsByClassName`: + Pros: More flexible, as it returns all elements that match the class, allowing for more complex queries. + Cons: Slower and less efficient, especially when dealing with a large number of matching elements. **Library and purpose:** In this benchmark, no external library is used. However, `document` is an essential part of the JavaScript DOM (Document Object Model), which provides an interface to manipulate HTML documents. **Special JS feature or syntax:** There are no special features or syntaxes used in this benchmark that require specific knowledge of advanced JavaScript concepts. **Other alternatives:** If you need to compare performance of other methods for retrieving elements, some alternatives could be: * `document.querySelector`: Similar to `getElementsByClassName`, but with a more modern and efficient API. * `querySelectorAll` (for older browsers): Another method for selecting elements by class or ID. Keep in mind that the choice of method depends on your specific use case, performance requirements, and compatibility concerns.
Related benchmarks:
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