With Maps you may for instance:

              -- M0 = #{ a => 1, b => 2}, % create associations

              -- M1 = M0#{ a := 10 }, % update values

              -- M2 = M1#{ "hi" => "hello"}, % add new associations

              -- #{ "hi" := V1, a := V2, b := V3} = M2. % match keys with
              values

              For information on how to use Maps please see the Reference
              Manual.

              The current implementation is without the following features:

              -- No variable keys

              -- No single value access

              -- No map comprehensions

              Note that Maps is experimental during OTP 17.0.

On Preserving Term Sharing in the Erlang Virtual Machine

摘要:In this paper we describe our experiences and argue through examples why flattening terms during copying is not a good idea for

a language like Erlang. More importantly, we propose a sharing preserving copying mechanism for Erlang/OTP and describe a pub-
licly available complete implementation of this mechanism.