You are building an application running inside the web browser (a classic SPA). You have to read a list of user's followers' usernames from the server. This list can contain thousands of usernames. You need to implement a component that finds a username from the list based on user input. For example given a list of usernames 'fred', 'frank', 'jerry' . When a user types fr , you should filter the list so that usernames starting with fr are included ( fred and frank in this case). How would you implement this (data structures and algorithms)?

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