How do you implement input filtering in a React app to search through a country list?

To implement input filtering for a country list, you first create a state variable (e.g., search) to track what the user is typing. Then attach an onChange handler to the input field that updates this state with event.target.value. The filtering logic compares the search term with each country name by converting both to lowercase for case-insensitive matching. The filtered results are stored in a variable that uses JavaScript's filter method to loop through the country data and return only those countries whose names include the search term. This approach allows for real-time filtering as users type, providing immediate feedback without requiring extra clicks or form submissions.