Initial data commit

Task/Visualize-a-tree/11l/visualize-a-tree.11l

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+T Node
+   String value
+   Node? left
+   Node? right
+
+   F (value, Node? left = N, Node? right = N)
+      .value = String(value)
+      .left = left
+      .right = right
+
+   F tree_indent() -> [String]
+      V tr = I .right != N {.right.tree_indent()} E [‘-- (null)’]
+      R [‘--’(.value)] [+] (I .left != N {.left.tree_indent()} E [‘-- (null)’]).map(a -> ‘  |’a)
+                       [+] [‘  `’tr[0]] + tr[1..].map(a -> ‘   ’a)
+
+V tree = Node(1, Node(2, Node(4, Node(7)), Node(5)), Node(3, Node(6, Node(8), Node(9))))
+print(tree.tree_indent().join("\n"))