Dutch national flag problem: Difference between revisions
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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This problem is very easy to solve in Haskell. No algorithms necessary, because Haskell provides everything we need. |
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With the Color data type we take care that no other values than Red, White and Blue can be used. |
With the Color data type we take care that no other values than Red, White and Blue can be used. |
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The "deriving" clause is a key aspect: We want Haskell to make Color automatically an instance of the classes Show, Eq, Ord and Enum. |
The "deriving" clause is a key aspect: We want Haskell to make Color automatically an instance of the classes Show, Eq, Ord and Enum. |
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