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You also can't implement generators using an array. There's a reason why generators were added to ES6 -- they aren't just syntactic sugar.

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If they aren't just syntactic sugar - how to you think regenerator works? Show me a generator and I show you perfectly fine, synchronous (though verbose) ES5 code doing the exact same thing.

Well, "syntactic sugar" usually refers to things that can be translated in a syntactically local, structure-preserving way. I'm aware that generators can be compiled down to an ES5 representation, but it requires non-trivial analysis. Take a look at the example on their home page: https://facebook.github.io/regenerator/.

Do you also consider functions to be syntactic sugar? Because you can also implement them in terms of a switch statement.

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