Flutter for Beginners

Constructors

To instantiate a class, we use the new keyword, followed by the corresponding constructor with parameters, if required. Now, let's change the Person class and define a constructor with parameters on it:

class Person {    String firstName;    String lastName;    Person(String firstName, String lastName) {      this.firstName = firstName;      this.lastName = lastName;     }    String getFullName() => "$firstName $lastName";}main() {  // Person somePerson = new Person(); this would not compile as we     //defined mandatory parameters on constructor  Person somePerson = new Person("Clark", "Kent");    print(somePerson.getFullName());}

The constructor is also a function in Dart and its role is to initialize the instance of the class properly. As a function, it ...