unnest_dfs_within_list_of_fully_named_lists {csutil}

Unnest data.frames within fully named list

Description

Consider the situation where a function returns a list containing two data.frames. If this function is called repeatedly and the return values are stored in a list, we will have a list of fully named lists (each of which contains a data.frame). Typically, we want to extract the two data.frames from this nested list structure (and rbindlist them).

Usage

unnest_dfs_within_list_of_fully_named_lists(
  x,
  returned_name_when_dfs_are_not_nested = "data",
  ...
)

Arguments

x

A list of fully named lists (which then contain data.frames)

returned_name_when_dfs_are_not_nested

When x is a single list of data.frames, what name should be returned?

...

parameters passed to data.table::rbindlist

Value

Fully named list, each element containing a data.table.

Examples

x <- list(
  list(
    "a" = data.frame("v1"=1),
    "b" = data.frame("v2"=3)
  ),
  list(
    "a" = data.frame("v1"=10),
    "b" = data.frame("v2"=30),
    "d" = data.frame("v3"=50)
  ),
  list(
    "a" = NULL
  ),
  NULL
)
print(x)
csutil::unnest_dfs_within_list_of_fully_named_lists(x)

x <- list(
  data.frame("v1"=1),
  data.frame("v3"=50)
)
print(x)
csutil::unnest_dfs_within_list_of_fully_named_lists(
  x,
  returned_name_when_dfs_are_not_nested = "NAME",
  fill = TRUE
)