Android Development with Kotlin

Parameters

Parameters in Kotlin functions are declared using Pascal notation, and the type of each parameter must be explicitly specified. All parameters are defined as read-only variables. There is no way to make parameters mutable, because such behavior is error-prone and in Java it was often abused by programmers. If there is a need for that, then we can explicitly shadow parameters by declaring local variables with the same name:

    fun findDuplicates(list: List<Int>): Set<Int> { 
        var list = list.sorted() 
        //... 
    } 

This is possible, but it is treated as bad practice, so a warning will be displayed. A better approach is to name parameters by the data they provide and variables by the purpose they serve. These names should then be different ...