Exercises & learning objectives

[qdread]

I think the exercises are generally good in terms of how they are written and the level of difficulty, but I had some comments on a couple of them from a pedagogical standpoint.

• For the first exercise, walk2 is used but the difference between map and walk is not really explained in the lesson, nor is the *2. I think that can be fine if you want people to figure it out for the exercise, but those are also important features of the purrr package, so might be worth explaining in the lesson.
• For exercises 4 and 7 where you have people monkeying with ggplot2 formatting, I think maybe there is the potential where people can get bogged down in trial and error trying to figure out how to get it just right. It might not further the learning objectives that much. But then again you do say it's a bonus so maybe that's fine 😀

[khondula]

removed previous exercise 4, but leaving open to address other issues. asking too much in exercise 1 - introduce at least either map2 or walk before asking about walk2

make solution for exercise 7 is separate issue - maybe label as a challenge or something else since its more advanced

[khondula]

More specifics for future improvements to expand section on map functions to make it clearer what the family of functions is and what the main arguments are. Essentially provide enough content in the lesson to be able to do exercise 1 without too much new info

• Include an example with a vector of a specific type like map_int before introducing map_dfr.
• show how to use functions with 2 arguments, show or link to info about pmap for n arguments
• maybe explain difference between map and walk functions