How to convert member of class list to List<String> in one line code?

Question

I have a List<MyClass> myClass;, I want to get List<String> myList; from all of myClass.item, is there one line way to convert it?

read List.map official documentation (and Iterable documentation in general) — pskink
– pskink, Commented Dec 5, 2020 at 15:14

bluenile · Accepted Answer · 2020-12-06 05:01:27Z

2

You can use the map method from List class to loop through the entire list. Don't forget to call toList in the end, as Dart's map returns a kind of Iterable. Please see the code below.

class Employee {
  int id;
  String firstName;
  String lastName;
  Employee(
    this.id,
    this.firstName,
    this.lastName,
  );
}

void main() {
  List<Employee> employees = <Employee>[
    Employee(1, "Adam", "Black"),
    Employee(2, "Adrian", "Abraham"),
    Employee(3, "Alan", "Allan"),
  ];

  List<String> myList = employees.map((item)=>item.firstName).toList();
  print(myList);
}

edited Dec 6, 2020 at 5:01

answered Dec 5, 2020 at 15:52

bluenile

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2 Comments

mikezang Over a year ago

How can I do if I just need ["Adam", "Adrian", "Alan"]?

bluenile Over a year ago

Updated my answer please see the code above.

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