dot-list_of_lists_to_df: Convert a multilevel list to a nested dataframe

In rsurvstat: Download Infectious Disease Data from 'SurvStat' (Robert Koch Institute)

Convert a multilevel list to a nested dataframe

Description

Convert a multilevel list to a nested dataframe

Usage

.list_of_lists_to_df(lst, ...)

Arguments

lst	a multilevel list
...	Named arguments passed on to .transpose x a data.frame or row_list .fix collapse or expand names in redundant multi-level row_lists. Either FALSE or a string to join or split the names of the multi-level list by ... not used

Value

a dataframe with each sublist nested as a dataframe

Unit tests

iris_list = .df_to_list_of_lists(iris, .fix=FALSE)
iris2 = .list_of_lists_to_df(iris_list, .fix=FALSE)

testthat::expect_equal(datasets::iris, as.data.frame(iris2))

mtcars_nest = datasets::mtcars 
  dplyr::mutate(name = rownames(.)) 
  tidyr::nest(details = -c(cyl,gear))

mtcars_list = mtcars_nest 

mtcars_nest2 = mtcars_list 

testthat::expect_equal(
  mtcars_nest2$details[[2]],
  mtcars_nest$details[[2]]
)

# test unequal length vector column is mapped to list of vectors
# and multiply named nests are treated as rows
testlist = list(
   row = list(a=1:5, b="x"),
   row = list(a=2:4, b="y"),
   row = list(a=3, b="z")
)
testdf = testlist 
testthat::expect_equal(testdf$b, c("x", "y", "z"))
testthat::expect_equal(testdf$a[[2]], 2:4)

rsurvstat documentation built on Feb. 20, 2026, 5:09 p.m.