Very easy Kotlin solution
\n# Code\n\nclass Solution {\n    fun getConcatenation(nums: IntArray): IntArray {\n        return nums + nums\n    }\n}\n
\n# Code\n```\nclass Solution {\n    fun getConcatenation(nums: IntArray): IntArray {\n        return nums + nums\n    }\n}\n```
['Kotlin']