Flatten a named, nested list of atomic vectors to a single level using the concatenated list/atomic vector names as the names of the single tiered list.
flatten(x, sep = "_", ...)
Returns a flattened list.
A nested, named list of vectors.
A separator to use for the concatenation of the names from the nested list.
ignored.
StackOverflow user @Michael and Paul Foster and Tyler Rinker <tyler.rinker@gmail.com>.
https://stackoverflow.com/a/41882883/1000343
https://stackoverflow.com/a/48357114/1000343