Initial data commit

Task/Visualize-a-tree/Jq/visualize-a-tree-1.jq

@@ -0,0 +1,27 @@
+# Input: an array representing a tree
+# Output: a stream of strings representing the tree
+# In this implementation, empty arrays in the tree are simply ignored.
+def printTree:
+
+  def tidy:
+    sub("└─$"; "  ")
+    | sub("├─$"; "| ") ;
+
+  # Input: a string prefix
+  def print($tree):
+    if $tree|type != "array" then . + ($tree|tostring)
+    else # ignore empty arrays
+    ($tree | map(select(if type == "array" then length>0 else true end))) as $tree
+    | if $tree|length == 0 then empty
+      elif $tree|length == 1
+      then print($tree[0])
+      else print($tree[0]),
+           ($tree[1:] as $children
+            | tidy as $p
+             | ($p + ( "├─" | print($children[:-1][]))),
+               ($p + ( "└─" | print($children[-1]))) )
+      end
+    end ;
+
+  . as $tree
+  | "" | print($tree) ;

Task/Visualize-a-tree/Jq/visualize-a-tree-2.jq

@@ -0,0 +1,21 @@
+def bigTree:
+  ["a",
+   ["aa",
+    ["aaa",
+     ["aaaa"],
+     ["aaab",
+      ["aaaba"],
+      ["aaabb"]],
+     ["aaac"]]],
+   ["ab"],
+   ["ac",
+    ["aca"],
+    ["acb"],
+    ["acc"]]] ;
+
+[0, 1, 2, 3],
+[1,[2,3,[4, 5, [6,7,8], 9, [10,11]]]],
+bigTree
+| ("Tree with array representation:\n\(.)\n",
+  printTree,
+  "")