If you already know C++, C#, or Java, you can be productive with Dart in just a few days. All jokes aside, Dart one of the best languages you can learn in 2k19. It’s also a good first language , (at least easier than Java, in my opinion).
Read moreWhat should I know before learning Dart?
So basically any Object oriented programming based language like Java, C++, C# or even JavaScript knowledge is enough to learn Dart language. Dart is moderate to learn which means it will be easy for those who at least have some hands on development experience.16 Eki 2018
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