Why doesn't group_by %>% purr::f() behave the same way as summarise()?

[bragks]

@jcblum

If I'm manipulating data frames, I start with dplyr , but keep some of the tools from purrr in my back pocket for the more exotic problems. And don't forget tidyr ! nest() + purrr and gather() / spread() + dplyr are like my magical keys for unlocking a ton of weird data manipulation puzzles!

You wouldn't happen to have any worked examples of this? I feel like the concept of nesting in general is ok to understand, but I'm having some trouble seeing when I would use it.