The main are:
Ruby: DSL, metaprogramming abilities in general, method chaining and how enumerables are designed.
Erlang: simplicity, how VM and OTP are designed, ease of concurrency, hot code reload, messages as the process intercommunication.
Elixir: better metaprogramming abilities than in Ruby, more concise syntax than Erlang, plus all the above—the best from both languages.
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