Practice with the map() family of functions
The syntax for the map() family of functions is:
## DO NOT RUN
map(object, function_to_apply)
For example, let’s practice with creating a list called list_purrr:
library(purrr)
list_purrr <- list(c(0:10), c(20:30), c(40:50))
list_purrr
Now if we wanted to take the median value for each of the components using the map() function:
map(list_purrr, median)
This will return a list. However, if we wanted the output to be returned as a numeric vector, we could use the map_dbl() function:
map_dbl(list_purrr, median)
Or we could return a character vector:
map_chr(list_purrr, median)
This flexibility of the map() family of functions can be really useful.