011 Class Constructors & Named Arguments |#flutterdeveloper | #flutter #programming Complete course

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I will show you how to define and work with Constructors in Dart/Flutter. There are many types of Constructors that you will need to know when working with Dart class.

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Contents [hide]

Dart Constructor methods
Dart Constructor with Syntactic sugar
Multiple constructors in Dart/Flutter
Redirecting Constructor
Factory Constructor in Dart/Flutter
Dart/Flutter Constructor with Optional parameters
Dart Constructor using Square brackets: Positional optional parameters
Dart Constructor using Curly braces: Named optional parameters
Dart/Flutter Constructor default value
Positional optional parameters
Named optional parameters
Constant constructor
Conclusion
Further Reading
Dart Constructor methods
Constructor is a special method of Dart class which is automatically called when the object is created. The constructor is like a function with/without parameter but it doesn’t have a return type.

For example, this is Customer class with constructor that has the same name:

class Customer {
String name;
int age;
String location;

// constructor
Customer(String name, int age, String location) {
}
}
Now you can create new object using a constructor.

var customer = Customer("bezkoder", 26, "US");
If we don’t define any constructor, the default constructor below will be created.

Customer() {
}
Dart Constructor with Syntactic sugar
If you use constructor with nornal syntax above, you need to write boilerplate to assign each argument to an instance variable.

Dart supports syntactic sugar to make it easy.

class Customer {
String name;
int age;
String location;

}
Multiple constructors in Dart/Flutter
How about the case you want to have more than one constructor. For example, there are 2 constructors you desire to use:

Customer(String name, int age, String location) {
}

}
But if you define both of them in a class, there will be a compiler error.

Dart provides Named constructor that helps you implement multiple constructors with more clarity:

class Customer {
// ...

Customer(String name, int age, String location) {
}

// Named constructor - for multiple constructors
}

name = "";
age = 0;
location = "";
}

@override
String toString() {
}
}