Exercise 20: Check if Element has Class
Problem Statement
Function `hasClass(el, className)` banao jo check kare ki element pe class hai ya nahi.
Example: hasClass(buttonEl, "active") => true/false
Sample Output:
hasClass(buttonEl, "active") => true (if class exists) hasClass(buttonEl, "inactive") => false (if not)
Solution
const hasClass = (el, className) => el?.classList.contains(className) ?? false;Explanation
Overall Goal:
- Element pe class hai ya nahi check karna.
Real world:
- Conditional logic: class-based checks.
- State checks: class-based states.
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