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Google announced Kotlin as an Android official programming language in 2017, giving developers an option of writing applications using a language that combines object-oriented and functional features. Aims: The goal of this work is to understand the usage of Kotlin features considering four aspects: i) which features are adopted, ii) what is the degree of adoption, iii)when are these features added into Android applications for the first time, and iv) how the usage of features evolves alongarXiv:1907.09003v3 fatcat:xivlhejsvza3tluhzgkastvf7u