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I had never heard of Kotlin but after looking at the docs I am very impressed. I spend most of my time in the web development world (PHP, Javascript) but I am thinking about starting a small Android project.

I have zero Java knowledge so I wonder if it is feasible to jump straight into using Kotlin or to try and learn some Java first?

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If you want to leverage the whole 100% interoperability of Java (which is a HUGE selling point for Kotlin), I think knowing some Java will be extremely helpful. If you're starting a project from scratch, it might not be necessary if you're building on projects like dropwizard-kotlin, etc.

Knowing Java is quite helpful if you're building for the JVM, but if your target is JS, then its not much of a problem.

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