[LC0690](https://leetcode.com/problems/employee-importance/)\n\n[Original Post](https://leetcode.com/problems/employee-importance/discuss/1297283/Feedback-Employee-in-Kotlin)\n\n@admin, please consider defining the Employee class as this:\n```\ndata class Employee(val id: Int, val importance: Int, val subordinates: List<Int> = listOf())\n```\nReasons are:\n1. no field must be mutable\n2. `data` keyword helps with destructuring later on, than bare/regular classes.\n\nAlso for the method signature, I think `List<Employee>` should be enough, no need in `List<Employee?>`, which is unnecessarily open in my opinion.\n\nThanks.

LC0690\n\nOriginal Post\n\n@admin, please consider defining the Employee class as this:\n\ndata class Employee(val id: Int, val importance: Int, val subordinate