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**list**is empty.

**length**:: [a] -> Int:

**length**returns the

**length**of a finite

**list**as an Int. It is an instance of the more general genericLength, the result type of which may be any kind of number.

**List**transformations map:: (a -> b) -> [a] -> [b] map f xs is the

**list**obtained by applying f to each element of xs, i.e.,.