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kotlinlang

Good Morning people... Sorry by my very very bad English .. I'm Brazilian and new with kotlin... but go try ... I see many examples in the web and all of them uses 'VAL' for create properties ... Then I think: When update an registry ... how to make? If 'Val' is equivalent to 'Final' of the Java ...

By default final or val is a thread safe. You you will expect no one can change the value after he created. 

In kotlin, you should use val as long as possible.

And you don't need extract lock for that. Because of thread safe.