04. HC4 ‐ Haskell Chapter 4 Practical Tasks ‐ Pattern Matching in Functions - wimsio/universities GitHub Wiki
HC4T1 - Task 1: Define a weatherReport Function
Create a function weatherReport :: String -> String that takes a weather condition as a string (e.g., "sunny", "rainy", "cloudy") and returns a message describing the weather. Use pattern matching to handle the following cases:
"sunny"→"It's a bright and beautiful day!""rainy"→"Don't forget your umbrella!""cloudy"→"A bit gloomy, but no rain yet!"- Any other input should return
"Weather unknown".
HC4T2 - Task 2: Define a dayType Function
Create a function dayType :: String -> String that determines if a given day of the week is a weekday or weekend.
"Saturday"and"Sunday"→"It's a weekend!"- Any other day of the week →
"It's a weekday." - If an invalid day is provided, return
"Invalid day".
HC4T3 - Task 3: Define a gradeComment Function
Write a function gradeComment :: Int -> String that takes a numerical grade and returns a comment based on the grade range:
90 - 100→"Excellent!"70 - 89→"Good job!"50 - 69→"You passed."0 - 49→"Better luck next time."- Any other number →
"Invalid grade".
HC4T4 - Task 4: Rewrite specialBirthday using Pattern Matching
Rewrite the specialBirthday function using pattern matching instead of if-else statements.
HC4T5 - Task 5: Add a Catch-All Pattern with a Custom Message
Modify specialBirthday to include the age in the return message when it doesn’t match predefined cases.
HC4T6 - Task 6: Identify List Contents Using Pattern Matching
Create a function whatsInsideThisList that returns a string based on the number of elements in a list.
HC4T7 - Task 7: Ignore Elements in a List
Modify firstAndThird to return only the first and third elements of a list, ignoring others.
HC4T8 - Task 8: Extract Values from Tuples
Create a function describeTuple that extracts values from a tuple and returns a string.