17. HC17 ‐ Haskell Chapter 17 Practical Tasks: Semigroup‐and‐Monoid - wimsio/universities GitHub Wiki

HC17T1: Create a Severity data type representing the severity of an emergency with four levels (Low, Medium, High, Critical). Implement a Semigroup instance for this type, where the higher severity overrides the lower one.

HC17T2: Define a Min and Max newtype for any Ord type and implement their respective Semigroup instances using min and max.

HC17T3: Implement the Monoid instance for the Severity type, where the identity value is Low.

HC17T4: Implement the Monoid instance for the Sum newtype, where the identity element is 0.

HC17T5: Implement a function combineLists that uses the Semigroup instance to concatenate two lists of integers.

HC17T6: Define a function maxSeverity that combines a list of Severity values using mconcat.

HC17T7: Implement a function multiplyProducts that takes a list of Product values and returns the combined result using mconcat.

HC17T8: Write a function foldWithSemigroup that accepts any list of a type with a Semigroup instance and combines all elements using foldr.

HC17T9: Define a Config data type with fields for loggingLevel, timeout, and retries. Implement a Semigroup instance that combines configurations by taking the maximum loggingLevel and retries and the minimum timeout.

HC17T10: Implement the Monoid instance for the Config data type, where the identity element is a configuration with the lowest loggingLevel, highest timeout, and lowest retries.

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