18. HC18 ‐ Haskell Chapter 18 Practical Tasks: Functor

1. HC18T1: Define a function mapToLower using fmap that converts all characters in a list to lowercase.
2. HC18T2: Create a Functor instance for the binary tree type Tree.
3. HC18T3: Define a function incrementTreeValues that adds one to every value in a tree using the Functor instance.
4. HC18T4: Implement a function mapToBits to convert a list of Booleans to characters '1' or '0' using fmap.
5. HC18T5: Define a Functor instance for the Either type, applying fmap only to the Right case.
6. HC18T6: Implement a function applyToMaybe that uses fmap to transform the value inside a Maybe.
7. HC18T7: Define a function fmapTuple that applies a function to the second element of a tuple (a, b) using the Functor instance of (,) a.
8. HC18T8: Implement the identityLawCheck function to verify the Functor identity law.
9. HC18T9: Implement the compositionLawCheck function to verify the Functor composition law.
10. HC18T10: Create a function nestedFmap that applies a function to a nested structure using multiple fmap calls.

Chapter 11

1. HC11T1: Implement a Functor instance for a three-element tuple ((,,) a b).
2. HC11T2: Define a function fmapTriple that applies a function to the third element of a three-element tuple.

Chapter 12

3. HC12T1: Write a function nestedMap that applies a function to a nested Functor of depth 2.
4. HC12T2: Test the identity law on a nested Functor structure.

Chapter 13

5. HC13T1: Create a Functor instance for the function type ((->) r).
6. HC13T2: Implement a function that applies fmap to a function type and composes transformations.

Chapter 14

7. HC14T1: Define a function replaceInFunctor using the <$ operator to replace all values in a Functor with a single constant.
8. HC14T2: Implement and test the flipped version $> to achieve the same as <$.

Chapter 15

9. HC15T1: Write a function applyVoid using void to trigger side effects within a Functor while discarding the result.
10. HC15T2: Test void on different Functors like Maybe, [], and custom types.

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