Exercise 15: Check if Element Contains Another
Problem Statement
Function `contains(parent, child)` banao jo check kare ki parent element child ko contain karta hai ya nahi.
Example: contains(parentEl, childEl) => true/false
Sample Output:
contains(parentEl, childEl) => true (if parent contains child) contains(parentEl, otherEl) => false (if not)
Solution
const contains = (parent, child) => parent?.contains(child) ?? false;Explanation
Overall Goal:
- Parent element child ko contain karta hai ya nahi check karna.
Real world:
- DOM traversal: parent-child checks.
- Event delegation: target checks.