map_*
The map()
function will return its output as a list. However, there are several different map()
functions; you can use map_*()
functions to tell purrr
the type of output you want. The * in map_*()
represents different R data types. For instance, you might want the output to be a vector of numbers so that we can put it inside a data frame. So, unless you want something to be returned as a list, you need to determine what you want the output to be before you write your map()
function.
This exercise is part of the course
Foundations of Functional Programming with purrr
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Map over wesanderson, to determine the length of each element
map(___, ___)