Exercise

# Counting favorites

Let's continue our exploration of the RStudio Conf dataset. Remember that this dataset is a list of 5000+ sublists, each sublist being a tweet containing the #RStudioConf hashtag.

In this exercise, we'll extract a statistic about the tweets that were not retweets: the mean of the number of favorites. The `"favorite_count"`

element, contained in each sublist, is the number of people who have liked this specific tweet.

`purrr`

has been loaded for you, and the `rstudioconf`

dataset is still available in your workspace.

Instructions

**100 XP**

Prefill the

`mean()`

and`round()`

functions with`na.rm = TRUE`

and`digits = 1`

.Build a new function out of these two prefilled function, and call it

`rounded_mean()`

.Create a sublist of non-retweets.

Extract the

`"favorite_count"`

element from each sublist with the`map_*`

variant for integer, and pass the result to`rounded_mean()`

.