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110-checkerboard-generation.md

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Problem:

Checkerboard

Write a method checkerboard/Checkerboard which takes an integer size and returns a checkerboard of dimensions size x size. There are two colored squares on the checkerboard. Red squares are represented by the string [r] and black squares are represented by the string [b]. You MUST use the newline character \n to insert a newline at the end of each row.

  • The top left corner should be a red square.
  • Each row should have alternating squares in the row.
  • The starting square on each row should also alternate.

Assumptions

  • You can assume you are given an integer size.
  • You cannot assume positive values.
    • Thus you should return an empty string for negative sizes and a size of 0. (An empty string does not have a newline ending).
  • You should assume the newline character used is \n.
  • You MUST leave a newline character at the end of the full checkerboard thus allowing the board to be on its own if you were to run in a terminal.

Examples

puts checkerboard(5);
[r][b][r][b][r]
[b][r][b][r][b]
[r][b][r][b][r]
[b][r][b][r][b]
[r][b][r][b][r]
checkerboard(8);
"[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]"
putStr $ checkerboard 8
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
[r][b][r][b][r][b][r][b]
[b][r][b][r][b][r][b][r]
Kata.Checkerboard(8) =>
"[r][b][r][b][r][b][r][b]\n" +
"[b][r][b][r][b][r][b][r]\n" +
"[r][b][r][b][r][b][r][b]\n" +
"[b][r][b][r][b][r][b][r]\n" +
"[r][b][r][b][r][b][r][b]\n" +
"[b][r][b][r][b][r][b][r]\n" +
"[r][b][r][b][r][b][r][b]\n" +
"[b][r][b][r][b][r][b][r]\n";

What We're Testing

We're testing loops and conditionals and aiming at beginners. There are many ways of achieving the solution so the correct solution will present a fairly basic version that should be more advanced than typical loop examples and has some extra challenge to the problem with the alternating on columns and rows.

Solution