In Conclusion

Maps represent the culmination of Erlang’s journey toward a native, efficient, flexible associative data structure. They’re not perfect for every situation—records still have their place, and proplists maintain certain advantages for literal options—but they’re remarkably close to being the universal solution for “I need to associate keys with values.”

Use them with confidence, but not recklessness. Use them with understanding, but not anxiety. And remember: in the end, they’re just data structures. Very sophisticated, beautifully implemented, immutable data structures. But data structures nonetheless.

The answer to the ultimate question of maps, the universe, and everything is not 42. It’s #M(answer 42). Subtle difference, that.