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haskell/sessions/16_03/notes.md
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## Table
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| Topic | Description | Confidence |
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|-------|-------------|------------|
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| Signatures | Checking whether the expression types are correct | 😐 |
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| Programming | Writing code to solve an algorithmic problem | 😐 |
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| Higher order functions | Demonstrate understanding of higher order functions, usually by chaining them | 😊 |
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| List comprehensions | Demonstrate understanding of list comprehensions | 😊 |
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| Recursion/infinite lists | Infinitely generating lists, usually by recursion and/or list comprehensions | 😐 |
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| ADTs | Algebraic Data Types, usually defining a data type and writing functions that operate on it | 😕 |
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| Proof on lists | Proving properties of functions that operate on lists | 😕 |
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| Proof on trees/ADTs | Proving properties of functions that operate on trees or ADTs | 😕 |
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```hs
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expr = (:) . (:)
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(:) :: a -> [a] -> [a]
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(.) :: (c -> d) -> (b -> c) -> b -> d
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=>
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a -> ([a] -> [a]) = b -> c
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b = a
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c = [a] -> [a]
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---
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a' -> [a'] -> [a'] = c -> d
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a -> [a] -> [a] = b -> c
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b = a
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c = [a] -> [a]
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a' = [a] -> [a]
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[[a] -> [a]] -> [[a] -> [a]] = d
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expr :: b -> d
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=>
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expr :: a -> [[a] -> [a]] -> [[a] -> [a]]
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```
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```hs
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f = \x y -> x (x (x y))
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```
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Rigorous solution of the above.
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## Look into
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> How does one do the equations?
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> CLI is functional lol
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> Lazy and singly-linked lists
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> Y combinator - ?
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## Resources
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- [course](https://www.cis.upenn.edu/~cis1940/spring15/lectures.html)
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- [standard list](https://hackage.haskell.org/package/base-4.21.0.0/docs/Data-List.html)
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