# Reverse function

a Function for reversing a list

## Illustration

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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