How to transform a List into a new List by excluding a property in T. 
For instance if User data class has 10 properties, I need to transform List into a new List without one particular property in User . New List like List
 data class User(val name: String, val age: Int)

```
var userList = mutableListOf<User>()

var nameList= userList.map { it.name }

```

If a List to be created without property 'age'. Like

```
var withoutAgeList

```