How do you implement a search functionality in a React countries app?

To implement search functionality in a React countries app, first create a UI component containing an input field with a placeholder like 'search by name' and an H2 title. Then establish state management by defining a state variable (e.g., 'search') to track user input with the useState hook. When typing occurs, update this state with the input's value through an onChange handler. For filtering, create a 'filteredCountries' variable that uses JavaScript's filter method to compare each country's name against the search term. The filter logic should check if the search is empty or if the country's name includes the search term, then return only matching countries to display.