JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Exercise - Sort Out Facebook Groups by Location

The video tutorial guides viewers on writing an algorithm to filter users from two Facebook groups by location. It explains the global nature of Facebook groups and the need for a location filter. The tutorial details the data structure used, which involves arrays of objects containing user data. It provides step-by-step instructions on building a function that takes a location as an argument and returns a flattened array of users from that location. The video also offers tips on using the reduce method and accessing data within the function, encouraging viewers to share their solutions on Discord.

Explain what is meant by a 'flattened array' in the context of this algorithm.

What challenges might arise when trying to access information in the function that only takes a location as an argument?