Until now, you’ve been using vector functions inside
mutate() to create new
columns. In Vector functions, you learned how to convert some scalar functions
into vector functions. Sometimes, however, you’ll want to use a scalar function
to create a new column, and you won’t be able to convert that scalar function
into a vector function.
In this reading, you’ll learn how to create new columns with a scalar function by using a map function to apply that scalar function to each element of an existing column.