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a Function for reversing a list

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Language:Haskell's reverse function for lists works like this: 

Prelude> reverse [1,2,3]
[3,2,1]
Prelude> reverse "ABBA"
"ABBA"

In the first example, reverse is applied to a list of numbers.

In the second example, reverse is applied to a string, i.e., a list of characters.

Language:Haskell's reverse function for lists is defined like this: 

reverse :: [a] -> [a]
reverse =  foldl f []
 where f = flip (:)

That is, reverse performs a left-associative fold that composes the current element and the recursive result of folding. We illustrate this by inlining the definition of foldl for a specific argument list: 

reverse [1,2,3] = (([] `f` 1) `f` 2) `f` 3

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