at_depth(.x, .depth, .f, ...)
A list or atomic vector.
A function, formula, or vector (not necessarily atomic).
If a function, it is used as is.
If a formula, e.g.
This syntax allows you to create very compact anonymous functions.
If character vector, numeric vector, or list, it is
converted to an extractor function. Character vectors index by
name and numeric vectors index by position; use a list to index
by position and name at different levels. If a component is not
present, the value of
Additional arguments passed on to the mapped function.