Drill down to get the child node at a given index path or none. Negative
indexes are handled as in nthChild: as offsets from the end
of the forest with -1 being the last child, -2 the child before it, and
so on.
An empty path will return the given tree.
Type Param: A
Underlying tree type.
Param: path
a possibly empty array of numeric indexes that form a path from
root node to some child node.
accepted.
Drill down to get the child node at a given index path or none. Negative indexes are handled as in nthChild: as offsets from the end of the forest with
-1being the last child,-2the child before it, and so on.An empty path will return the given tree.
Type Param: A
Underlying tree type.
Param: path
a possibly empty array of numeric indexes that form a path from root node to some child node. accepted.
Param: self
node will be taken from the forest of this node.
Returns
An optional tree.