expand_list: Easy way to add an empty list to a list
In DavidBarke/QWUtils: Useful Methods For Programming with Shiny

Description Usage Arguments Details Examples

Add an empty list to a list at a position specified by a character vector, which is interpreted recursively. See Examples.

1	expand_list(.list, position)

`.list`	A list.
`position`	A character vector.

'[[' allows indexing a list with a vector, but only if the indices are already present in the list. expand_list implements an easy way to equip a list with the needed indices.

l <- list()
# Add empty list "a" on top level
l <- expand_list(l, "a")
# Add list "b" on top level with empty list "c" inside it
l <- expand_list(l, c("b", "c"))
# Add empty list "d" to the previously defined list "b"
l <- expand_list(l, c("b", "d"))