modify_tree | R Documentation |
modify_tree()
allows you to recursively modify a list, supplying functions
that either modify each leaf or each node (or both).
modify_tree( x, ..., leaf = identity, is_node = NULL, pre = identity, post = identity )
x |
A list. |
... |
Reserved for future use. Must be empty |
leaf |
A function applied to each leaf. |
is_node |
A predicate function that determines whether an element is
a node (by returning |
pre, post |
Functions applied to each node. |
Other modify variants:
map_depth()
,
modify()
x <- list(list(a = 2:1, c = list(b1 = 2), b = list(c2 = 3, c1 = 4))) x |> str() # Transform each leaf x |> modify_tree(leaf = \(x) x + 100) |> str() # Recursively sort the nodes sort_named <- function(x) { nms <- names(x) if (!is.null(nms)) { x[order(nms)] } else { x } } x |> modify_tree(post = sort_named) |> str()
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