I have a method that fetches all the users from the firebase database, and then I store all the users inside a list. let's say my list is:
user1 = User(
id: 1
name: "john"
car: false
)
user2 = User(
id: 2
name: "kim"
car: true
)
userList = [user1,user2]
How do I get the id of the user based on the name for example?
One of the simplest ways is using forEach(), which needs a function as argument:
class User{
final int id;
final String name;
final bool car;
User({this.id, this.name, this.car});
}
void main() {
User user1 = User(
id: 1,
name: "john",
car: false
);
User user2 = User(
id: 2,
name: "kim",
car: true
);
List<User> userList = [user1,user2];
userList.forEach((user){
if(user.name == "john")
print("ID: ${user.id}");
});
}
But you have more options, look up this list Top 10 Array utility methods you should know (Dart)
This way you can get all the johns:
List<User> johns = userList.where((user) => user.name == "jhon");
You can use the where on a list to filter it out. Example:
var userList = [user1,user2];
var kimList = userList.where((f) => f.name == 'kim').toList();
kimList.forEach((u) => print( '${u.name } - ${u.id}')); // will contain all the users where name is kim
References
