3
Given an array of any depth, draw its contents with borders of +-| around each subarray. Those are the ASCII characters for plus, minus, and vertical pipe.
For example, if the array is [1, 2, 3], draw
+-----+
|1 2 3|
+-----+
For a nested array such as [[1, 2, 3], [4, 5], [6, 7, 8]], draw
+--...