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Beyond the superficial syntax similarities and the fact that Jose Valim was a major Rails contributor I really don't get this Elixir = Ruby++ thing. The languages are poles apart, based on opposing paradigms (FP vs OOP) and data structures (immutable maps/lists vs mutable objects).

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It's more about Phoenix than Elixir alone. The language is approachable enough, although clearly different, and the frameworks are similar enough (router, controllers, templates, gem -> hex, etc.) that a rails dev can become productive in this environment relatively quickly. And, the effort to do so comes with a number of serious benefits.

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