Diamond

A letter for a diamond!

Kata instructions

Given a single letter, print a diamond starting with ‘A’ with the supplied letter at the widest point. This kata like many others is intended to be solved by applying Test-Driven Development (TDD).

Example for ‘A’:

Example for 'B':

 A
B B
 A

Example for 'C':

  A
 B B
C   C
 B B
  A

Get started

Use my Diamond program in command line as following.

mvn clean package -Pstandalone # to build it once
java -jar target/diamond-kata-0.1.0-SNAPSHOT-shaded.jar F # to run it as many times as you want

You will get this result.

     A
    B B
   C   C
  D     D
 E       E
F         F
 E       E
  D     D
   C   C
    B B
     A

My Diamond program works for uppercase letters as for lowercase letters. For example, the diamond printed for 'c':

  a
 b b
c   c
 b b
  a

Also use it as a Java library with Maven.

<dependency>
    <groupId>com.github.xapn</groupId>
    <artifactId>diamond-kata</artifactId>
    <version>0.1.0-SNAPSHOT</version>
</dependency>

And get any diamond you want like that.

import diamond.Diamond;
class Example {
    public static void main(String[] args) {
        String diamond = Diamond.of("X");
    }
}

License

The Diamond program is distributed under the GNU GPLv3 license. The GPLv3 license is included in the LICENSE.txt file. More information about this license is available at GNU.org.