Rowwise dplyr

rowwise_dplyr.R

# when you need to use tidyselect in a mutate function
# https://stackoverflow.com/questions/48353331/row-wise-operations-select-helpers-and-the-mutate-function-in-dplyr
tbl %>% mutate(a = select(., contains("abc")))

# based on https://rpubs.com/wch/200398
mtcars %>% purrrlyr::by_row(~any(is.na(.)), .collate = "rows", .to = "has_missing")

tibble(a=c(1, NA, 3), b=c(NA, 2, NA), c=c(NA, 5, 6)) %>% 
  mutate(pmap_int(., function(...) sum(lift_ld(is.na)(...))))

mtcars %>% split(seq(nrow(.))) %>% map...