Functionals.Rmd Exercise 9.4.6#3 vars should be nm

[Stephen Synchronicity]

adv-r/Functionals.Rmd

Line 786 in 714f95f

     mtcars[vars] <- map(vars, ~ trans[[.x]](mtcars[[.x]])) 

nm was the variable defined with the column names so it should read:
mtcars[nm] <- map(nm, ~ trans[[.x]](mtcars[[.x]]))