1. Learn
    2. /
  2. Courses
    3. /
  3. Foundations of Functional Programming with purrr

Exercise

Asking questions from a list

One of the great things about purrr is you can easily move from having a question about the data to an answer, with just a few lines of code. Here you are going to use the gh_users data to ask three questions:

  • Which user joined GitHub first?
  • Are all the repositories user-owned, rather than organization-owned?
  • Which user has the most public repositories?

In this exercise, your map_*() knowledge is really tested, so make sure to reflect on all the different flavors of map_*() and how they should be used.

Instructions 1/3

undefined XP
  • 1

    Name gh_users with the "name" element and sort the "created_at" element to determine who joined GitHub first.

  • 2

    Output a vector that returns TRUE for each element where the "type" is "USER".

  • 3

    Output a named numeric vector of the number of "public_repos".