TreeMapAt

TreeMapAt[f, tree, pos] applies f to the data at the position specified by pos in tree.

• TreeMapAt[f, tree, {pos1, pos2, ...}] applies f to the data at several positions.
• TreeMapAt[f, pos] represents an operator form of TreeMapAt that can be applied to a tree.

This function transforms data at specific positions in a tree structure.

Examples

tree = Tree[a, {Tree[b, {c, d}], e}];
TreeMapAt[ToUpperCase, tree, {1}]

TreeMapAt[# + 1 &, Tree[1, {Tree[2, {3, 4}], 5}], {1, 1}]

TreeMapAt[Style[#, Red] &, {1, 2}][Tree[a, {b, c, d}]]

*See the official Wolfram Language Reference for more details.