Iteration with purrr

You've made a great for loop, but it uses a lot of code to do something as simple as input a series of files into a list. This is where purrr comes in. We can do the same thing as a for loop in one line of code with purrr::map(). The function map() iterates over a list, and uses another function that can specified with the .f argument.

map() takes two arguments: