Maps

Calculates the difference between two (nested) maps, and returns a map representing the patch of changes.

Deep (recursive) merging for maps, keyword lists and whatever else you may want via implementing a simple protocol.

Indifferent access on maps/lists/tuples with custom key transforms.

Convert different mappable types to each other in Elixir

Mason uses superpowers to coerce maps into structs. This is helpful e.g. when you interface a REST API and want to create a struct from the response.