Small program
Combine types, patterns and folds into a small report.
What you will be able to do
- Model with a data type.
- Use foldr for totals.
- Print the result.
In plain English
Combine types, patterns and folds into a small report.
- Model with a data type.
- Use foldr for totals.
- Print the result.
data Lesson = Lesson String Int
total :: [Lesson] -> Int
total = foldr (\(Lesson _ m) acc -> m + acc) 0
main = print (total [Lesson "HTML" 12, Lesson "CSS" 18])Your turn
EasyExplain it back
Answer from memory: Which function folds a list from the right?
TEXT · starter
Your answer…Check your understanding before moving on.
Knowledge checkQuestion 1
Which function folds a list from the right?
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