I don't really understand, how can Erlang be more efficient than C++?
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One reason Erlang may be declining is because of newer functional programming languages, such as Elixir or Elm. Although Erlang is certainly useful, it's less accessible for beginners.
Erlang is far less efficient than C++. Erlang's big strength is scalability, not efficiency. It will linearly scale across multiple CPUs and, due to its programming and communications model, will very easily scale across machine clusters.
Just to be clear, Erlang won't scale more than C++; it just scales more easily than C++. A lot more easily. See chapters 5 and 6 of Concurrent Programming in Erlang for a very good explanation of why this is so.
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