Declare A Class In Dart

As a programming language that has a wide array of applications to mobile, web, and backend usage, Dart has become increasingly popular. Understanding how to declare a class in Dart is a fundamental skill for any Dart programmer. In this article, we will explore the basics of class declaration in Dart, using a simple example to guide you through the process.

Code Snippet

To illustrate the process, let’s declare a simple class named Car in Dart:

class Car {
  //properties
  String color;
  String model;
  int year;

  //method
  void start() {
    print("Car Started");
  }
}

Code Explanation

In Dart, a class is defined using the ‘class’ keyword followed by the name of the class. Here, ‘Car’ is the name of our class.

Next, we declare some properties of the car. These are variables that will hold data related to the car, such as its color, model, and year of manufacture. The syntax for declaring these is like any other variable declaration in Dart, in this case, the type of data followed by the variable name.

  //properties
  String color;
  String model;
  int year;

Then we define methods, which are functions that perform actions. A method typically does something related to the object. Here we define a simple method named ‘start’, which, when called, prints ‘Car Started’ to the console.

//method
  void start() {
    print("Car Started");
  }

In Dart, a class provides the blueprint for objects, so when you declare a class, you are effectively providing a specification for the creation of objects.

With a class declared, we can create an object of this class using the syntax: ClassName objectName = ClassName(); A simple example to create an object for the Car class would be Car myCar = Car();

To use the start method of our Car class via our object, we can easily call it: myCar.start();

To sum up, declaring a class in Dart involves proclaiming the properties or attributes of the class and the actions, or methods, the class’s object can perform. It’s crucial to understand that class declaration in Dart is very flexible, enabling more functions and properties to be added as your programming needs evolve.