**Packages**- is:exact

map `f xs` is the list obtained by applying `f`
to each element of `xs`, i.e.,

map f [x1, x2, ..., xn] == [f x1, f x2, ..., f xn] map f [x1, x2, ...] == [f x1, f x2, ...]

An associative operation
**NOTE**: This method is redundant and has the default
implementation `mappend = '(<>)'` since
*base-4.11.0.0*.

Map a function over all the elements of a container and concatenate
the resulting lists.

Map each element of the structure to a monoid, and combine the
results.