Nest() and unnest() operators

[hadley]

Would converted repeated values in to a list-column, and vice versa. Would be useful primitive when working with values like (1, 2, 3)

[hadley]

From tidyverse/dplyr#342

products <- strsplit(leads$Combo_Product_Interest__c, ";")
products[vapply(products, function(x) all(is.na(x)), logical(1))] <- list(NULL)

n <- vapply(products, length, numeric(1))

interest <- data.frame(
  Id = leads$Id[rep(1:nrow(leads), n)], 
  Product = unlist(products),
  stringsAsFactors = FALSE
)

[hadley]

Should also work with data frames?

[hadley]

And maybe named lists of data frames?

[andrewheiss]

This is a fantastic function and a perfect addition to tidyr. Please consider keeping it in (I'm slightly concerned about the "experimental" label…)

[hadley]

@andrewheiss it's mostly the unnest method for lists that's experimental. unnest() is here to stay.

[andrewheiss]

Oh good :)