Data commit

Task/Visualize-a-tree/Sidef/visualize-a-tree.sidef

@@ -0,0 +1,21 @@
+func visualize_tree(tree, label, children,
+                    indent = '',
+                    mids = ['├─', '│ '],
+                    ends = ['└─', '  '],
+) {
+    func visit(node, pre) {
+        gather {
+            take(pre[0] + label(node))
+            var chldn = children(node)
+            var end = chldn.end
+            chldn.each_kv { |i, child|
+                if (i == end) { take(visit(child, [pre[1]] ~X+ ends)) }
+                else          { take(visit(child, [pre[1]] ~X+ mids)) }
+            }
+        }
+    }
+    visit(tree, [indent] * 2)
+}
+
+var tree = 'root':['a':['a1':['a11':[]]],'b':['b1':['b11':[]],'b2':[],'b3':[]]]
+say visualize_tree(tree, { .first }, { .second }).flatten.join("\n")