July 2023
Intermediate to advanced
670 pages
17h 13m
English
Content preview from Effective Haskell
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Exercises
Reversing a List with Folds
It’s possible to easily implement a reverse function using folds. Try to implement a function that will reverse a list using both foldl and foldr. Which one is simpler? why? Might one be more efficient than the other?
Zipping Lists
The zip function is a special case of a more general function available in Prelude called zipWith. The zipWith function combines two lists according to a function. Consider this implementation of zip in terms of zipWith:
| | λ let zip' = zipWith (,) |
| | λ zip' [1..5] [5,4..1] |
| | [(1,5),(2,4),(3,3),(4,2),(5,1)] |
Implement the zipWith function with and without using list comprehensions. Can you implement zipWith using foldl?
Implementing concatMap
The concat function joins a list of ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.