Comprehensive Guide to Null Safety in Kotlin by Eu...
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roman.belov
03/30/2017, 12:14 PMComprehensive Guide to Null Safety in Kotlin by Eugen Baeldung
http://www.baeldung.com/kotlin-null-safety?utm_content=bufferfa2f3&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer