haskell-lectures/VL1/content/VL1_lists2.tex

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Let's check on a few very common list operations:
\begin{haskellcode*}{bgcolor=mygrey,frame=single,numbers=none,label=GHCi}
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> [1, 2] ++ [4, 5] -- append two lists
> head [1, 2, 3] -- first element
> tail [1, 2, 3] -- everything after the head
> reverse [1, 2, 3] -- reverse a list
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> take 2 [1, 2, 3] -- take the first two elements
> drop 2 [1, 2, 3] -- drop the first two elements
> sum [1, 2, 3]
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> elem 7 [1, 2, 3] -- is there a 7 in the list?
\end{haskellcode*}
\pause
A String in haskell is just a list of Chars!
\begin{haskellcode*}{bgcolor=mygrey,frame=single,numbers=none,label=GHCi}
> ['a', 'b', 'c']
> 'a' : []
> head "abc"
> 'a' ++ 'c'
\end{haskellcode*}