Reduce your fears about .reduce() - twentySomethingsLongFullNames-anonymous.js

twentySomethingsLongFullNames-anonymous.js

const twentySomethingsLongFullNames = users
      //  First we filter only the users who are in their twenties
      .filter(user => user.age >= 20 && user.age < 30)
      //  Combine first and last names
      .map(user => `${user.firstName} ${user.lastName}`)
      //  Now remove any names that are 9 or less characters
      .filter(fullName => fullName.length >= 10);