How to convert/transform a collection to another collection by element’s property?
it’s easy to do in Kotlin: // v— the variable type can be removed var nameMap: MutableList<String> = persons.map { it.name }.toMutableList(); IF you want an immutable List, it can simplify as below: // v— the variable type can be removed var nameMap: List<String> = persons.map { it.name }; OR using function reference expression instead: … Read more