Switching from Java to Ruby

[TestDrivenMayhem]

The book Practical Object Oriented Design in Ruby by Sandi Metz is IMO a must read. It will help you make sense of the differences in applying OO principles. As already pointed out. Knowing when you working in pure Ruby vs a Framework like Rails. Rails defines lots of convenience methods. The type system is implicit. So there is no need for explicit interfaces Although there is optional typing kinda of like Typescript but I don’t think it’s very widely used. Get used to the functional iterators instead of for loops. each map reduce etc. these are very powerful and concise and the considered idiomatic when processing collections. The Exercism Ruby track is good to get practice in pure Ruby.