Mapping over nodes
Mapping functions over nodes for relational data is different than for standard tabular data as you often want to recurse over a search or in other ways use the graph structure as part of your map.

map_bfs() map_bfs_lgl() map_bfs_chr() map_bfs_int() map_bfs_dbl()

Apply a function to nodes in the order of a breath first search 
map_bfs_back() map_bfs_back_lgl() map_bfs_back_chr() map_bfs_back_int() map_bfs_back_dbl()

Apply a function to nodes in the reverse order of a breath first search 
map_dfs() map_dfs_lgl() map_dfs_chr() map_dfs_int() map_dfs_dbl()

Apply a function to nodes in the order of a depth first search 
map_dfs_back() map_dfs_back_lgl() map_dfs_back_chr() map_dfs_back_int() map_dfs_back_dbl()

Apply a function to nodes in the reverse order of a depth first search 
map_local() map_local_lgl() map_local_chr() map_local_int() map_local_dbl()

Map a function over a graph representing the neighborhood of each node 