ASCII Charts (Part 3: Column Chart)

Given three arrays (daily sales of product A, daily sales of product B, daily sales targets), return a string representing a stacked column chart of the total sales (with targets) for each day of the week.

• All sales are rounded to the nearest 10 units.
• Each column uses "+" for product A, "*" for product B, and an underscore ("_") for the target line.
• The y-axis shows the total sales (the maximum combined sales will be 80).
• The x-axis shows the first two letters of each day of the week (Monday to Sunday).
• Product A sales are stacked on top of product B sales.
• Target underscores sit on the row above their actual value (see notes).
• Daily sales will never be greater than the target.
• All columns have a width of two characters.
• A single column of "|" is used to border the left and right-hand sides of the chart.
• All elements of the chart (x-axis, columns, borders) are seperate by a blank column one space wide.
• Use the newline character ("\n") to separate each line in the chart.

Example

columnChart([30, 20, 10, 30, 10, 20, 10], [20, 10, 10, 10, 20, 0, 10], [50, 40, 20, 40, 30, 30, 40]))
➞ "60 | __                   |\n50 | ** __    __       __ |\n40 | **       ** __ __    |\n30 | ++ ** __ ++ **       |\n20 | ++ ++ ** ++ ** ++ ** |\n10 | ++ ++ ++ ++ ++ ++ ++ |\n   | Mo Tu We Th Fr Sa Su |"

By day:

            Mo  Tu  We  Th  Fr  Sa  Su
productA = [30, 20, 10, 30, 10, 20, 10]
productB = [20, 10, 10, 10, 20,  0, 10]
target   = [50, 40, 20, 40, 30, 30, 40]

When printed:

60 | __                   |
50 | ** __    __       __ |
40 | **       ** __ __    |
30 | ++ ** __ ++ **       |
20 | ++ ++ ** ++ ** ++ ** |
10 | ++ ++ ++ ++ ++ ++ ++ |
   | Mo Tu We Th Fr Sa Su |

Notes

Be careful when placing the target underscores. Although the Monday target is 50 in the example above, the underscore is placed on the row where sales equal 60).