wrapr includes a lot of tools for writing better
%.>%(dot arrow pipe)
data.framebuilders and formatters )
:=(named map builder)
%.|%(reduce/expand args) NEW!
DebugFnW()(function debug wrappers)
λ()(anonymous function builder)
I’ll be writing articles on a number of the new capabilities. For now I just leave you with the nifty operator coalesce notation.
Coalesce takes values from its arguments in left to right order taking the first non-
NA value (if any available):
NA %?% 5 #  5 1 %?% 5 #  1 5 %?% NA #  5
For vectors each position is calculated independently, and scalars are re-cycled to vector sizes. This allows fairly complicated coalesce strategies (such as take from first two vectors if possible, else write in zero) to be expressed very succinctly:
vec1 <- c(1, 2, NA, NA) vec2 <- c(10, NA, 20, NA) vec1 %?% vec2 %?% 0 #  1 2 20 0
Data Scientist and trainer at Win Vector LLC. One of the authors of Practical Data Science with R.