instructions.md

In this exercise, you'll be implementing the quest logic for a new RPG game a friend is developing. The game's main character is Annalyn, a brave girl with a fierce and loyal pet dog. Unfortunately, disaster strikes, as her best friend was kidnapped while searching for berries in the forest. Annalyn will try to find and free her best friend, optionally taking her dog with her on this quest.

After some time spent following her best friend's trail, she finds the camp in which her best friend is imprisoned. It turns out there are two kidnappers: a mighty knight and a cunning archer.

Having found the kidnappers, Annalyn considers which of the following actions she can engage in:

• Fast attack: a fast attack can be made if the knight is sleeping, as it takes time for him to get his armor on, so he will be vulnerable.
• Spy: the group can be spied upon if at least one of them is awake. Otherwise, spying is a waste of time.
• Signal prisoner: the prisoner can be signalled using bird sounds if the prisoner is awake and the archer is sleeping, as archers are trained in bird signaling so they could intercept the message.
• Free prisoner: if the prisoner is awake and the other two characters are sleeping, a sneaky entry into the camp can free the prisoner. This won't work if the prisoner is sleeping, as the prisoner will be startled by the sudden appearance of her friend and the knight and archer will be awoken. The prisoner can also be freed if the archer is sleeping and Annalyn has her pet dog with her, as the knight will be scared by the dog and will withdraw, and the archer can't equip his bow fast enough to prevent the prisoner from being freed.

You have four tasks: to implement the logic for determining if the above actions are available based on the state of the three characters found in the forest and whether Annalyn's pet dog is present or not.

Tasks

1. Check if the 'Fast Attack' action is possible

Implement a function named canExecuteFastAttack that takes a boolean value which indicates if the knight is awake. This function returns true if the 'Fast Attack' action is available based on the state of the character. Otherwise, returns false:

knightIsAwake :: Boolean
knightIsAwake = true

canExecuteFastAttack knightIsAwake
-- => false

2. Check if the 'Spy' action is possible

Implement a function named canSpy that takes three boolean values, indicating if the knight, archer and the prisoner, respectively, are awake. The function returns true if the 'Spy' action is available based on the state of the characters. Otherwise, returns false:

knightIsAwake :: Boolean
knightIsAwake = true

archerIsAwake :: Boolean
archerIsAwake = true

prisonerIsAwake :: Boolean
prisonerIsAwake = true

canSpy knightIsAwake archerIsAwake prisonerIsAwake
-- => true

3. Check if the 'Signal Prisoner' action is possible

Implement a function named canSignalPrisoner that takes two boolean values, indicating if the archer and the prisoner, respectively, are awake. The function returns true if the 'Signal Prisoner' action is available based on the state of the characters. Otherwise, returns false:

archerIsAwake :: Boolean
archerIsAwake = false

prisonerIsAwake :: Boolean
prisonerIsAwake = true

canSignalPrisoner archerIsAwake prisonerIsAwake -- => true

4. Check if the 'Free Prisoner' action is possible

Implement a function named canFreePrisoner that takes four boolean values. The first three parameters indicate if the knight, archer and the prisoner, respectively, are awake. The last parameter indicates if Annalyn's pet dog is present. The function returns true if the 'Free Prisoner' action is available based on the state of the characters and Annalyn's pet dog presence. Otherwise, it returns false:

knightIsAwake :: Boolean
knightIsAwake = true

archerIsAwake :: Boolean
archerIsAwake = false

prisonerIsAwake :: Boolean
prisonerIsAwake = true

petDogIsPresent :: Boolean
petDogIsPresent = true

canFreePrisoner knightIsAwake archerIsAwake prisonerIsAwake petDogIsPresent
-- => false