Being a huge movie fan (remember your job at LucasFilms), you decide to start storing information on good movies with the help of lists.
Start by creating a list for the movie "The Shining". We have already created the variables mov, act and rev in your R workspace. Feel free to check them out in the console.
Complete the code on the right to create shining_list; it contains three elements:
mov)act)rev)Do not forget to name the list components accordingly (names are moviename, actors and reviews).
mov <- "The Shining"
act <- c("Jack Nicholson","Shelley Duvall","Danny Lloyd","Scatman Crothers","Barry Nelson")
sources <- c("IMDb1","IMDb2","IMDb3")
comments <- c("Best Horror Film I Have Ever Seen","A truly brilliant and scary film from Stanley Kubrick","A masterpiece of psychological horror")
scores <- c(4.5,4,5)
rev <- data.frame(scores, sources, comments)
rm(scores, sources, comments)
# The variables mov, act and rev are available
# Finish the code to build shining_list
shining_list <- list(moviename = mov)
# The variables mov, act and rev are available
# Finish the code to build shining_list
shining_list <- list(moviename = mov, actors = act, reviews = rev)
msg = "Do not remove or change the definition of the pre-set variables!"
lapply(c("mov", "rev", "act"), test_object, undefined_msg = msg, incorrect_msg = msg)
test_object("shining_list",
incorrect_msg = "It looks like `shining_list` does not contain the correct elements: the first element should be `mov`, the second element `act`, and the third `rev`.")
test_object("shining_list", eq_condition = "equal",
incorrect_msg = "It looks like `shining_list` does not contain the correct naming for the components: name the first element `moviename`, the second element `actors`, and the third element `reviews`.");
success_msg("Wonderful! You now know how to construct and name lists. As in the previous chapters, let's look at how to select elements for lists. Head over to the next exercise")
shining_list <- list(moviename = mov) is only part of the solution; it's your job to also add act and rev to the list, with the appropriate names.