<div class="test">Test</div>document.getElementsByClass("test");document.querySelector(".test")--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| getElementById | |
| querySelector |
| Test name | Executions per second |
|---|---|
| getElementById | 0.0 Ops/sec |
| querySelector | 818043.2 Ops/sec |
This benchmark compares two methods for selecting HTML elements: document.getElementsByClass() and document.querySelector().
Options Compared:
document.getElementsByClass("test"): This method retrieves all elements with the class "test". It returns a collection-like object (an HTMLCollection) which may not be as efficient for large numbers of elements. document.querySelector(".test"): This method selects the first element that matches the CSS selector ".test". It returns a single HTML element directly.Pros and Cons:
| Method | Pros | Cons |
|---|---|---|
getElementsByClass() |
Easier to understand for beginners | Can be slow for large sets of elements |
querySelector() |
More efficient for selecting single elements | Requires knowledge of CSS selectors |
Library Used: None. This benchmark utilizes built-in JavaScript DOM (Document Object Model) methods.
Special JS Features/Syntax: The benchmark uses basic JavaScript and HTML syntax, making it understandable to a wide audience.
Other Considerations:
querySelector() is generally faster than getElementsByClass(), especially for selecting single elements. This is because it uses a more efficient algorithm.getElementsByClass() might be sufficient. However, if you only need the first matching element, querySelector() is the better choice.Alternatives:
querySelectorAll(".test"): This method selects all elements matching the CSS selector and returns a static NodeList. It offers more flexibility than getElementsByClass() but might still be slower than querySelector() for single selections.Let me know if you have any more questions!
