Best Practices for Using JavaScript Selectors

Best Practices for Using JavaScript Selectors

1. Use IDs for Unique Elements
   Use getElementById or querySelector('#id') for elements that should be unique, like headers or footers.

2. Minimize DOM Traversals
   Store references to elements that are frequently accessed or manipulated.

3. Use querySelector for Flexibility
   For complex selectors (e.g., .class > div:first-child), prefer querySelector or querySelectorAll.

4. Check for Element Existence
   Always verify that the selected element exists to avoid runtime errors.
    

   Selector	Returns	Best Use Case
   getElementById	Single element	When targeting a unique element.
   getElementsByClassName	Live collection	For multiple elements by class.
   getElementsByTagName	Live collection	For elements by tag name.
   querySelector	Single element	Flexible, for complex selectors.
   querySelectorAll	Static NodeList	When multiple matches are needed.