“Must cutters think debugging is about fixing a mistake. But that’s boolshit. Debugging is actually all about finding the bug about understanding why the bug was there to begin with; about knowing that its existence was no accident, came here to deliver a message like an unconsious bubble floating to the surface, popping with a relevation you secretly kwown all along.” (Elliot)
Constructors in Dart are very flexible, allowing definition default or named constructor with positional or named parameters, optional, required or default values.
abstract class IHello { // Define interface
String sayHello(String msg);
factory IHello() { // factory constructor returns
return new Hello(); // instance of Hello
}
}
class Hello implements IHello {
sayHello(String name) {
return "Hello $name";
}
}
main() {
IHello myHello = new IHello();
var msg = myHello.sayHello("John");
print(msg);
}
In this basic example, I am using as most as possible features of basic features of the class definition in Flutter.
class Hello {
var hello; // public
var _name; // private
sayHello() {
return "$hello ${this.name}"; // string iterpolation
}
get name => _name; // getter
set name(value) => _name = value; // setter
}
main() {
var cHello = "Hello"; // no type annotation
final String cName = "John"; // typed annotation + final
var myHello = new Hello(); // instance creator
myHello.hello = cHello; // assignments
myHello.name = cName;
print(myHello.sayHello());
}
I recently started working with Flutter by creating my first mobile application for the company’s hackathon.
Prior, I took the course in O’Reilly, which amazingly introduced me to the world of “one code – multiple platforms”.
Flutter is the whole story and requires a separate post.
In the few posts, I’d like to share my expression from the Dart language – which is the language of programming for Flutter apps.
Dart is a programming language designed for client development,[8][9] such as for the web and mobile apps. It is developed by Google and can also be used to build server and desktop applications.
Wikipedia
It is an object-oriented, class-based, garbage-collected language with C-style syntax.[10] It can compile to either native code or JavaScript, and supports interfaces, mixins, abstract classes, reified generics and type inference.[11]
The Flutter multi-platform applications are programmed with Dart.
Dart code can be easily converted to JavaScript using dart2js tool.
There is a huge similarity between Dart syntax and Java and JavaScript languages as well as implemented features from other languages like Python.
While JavaScript implements the OOP principles prototypical, the syntax of Dart, is very close to Java with some additional possibilities (like positional and named parameters constructor, default values).
The ease of working with JSON structures and working with them as a Dart object.
Mixins, the widely used feature in Python, can be easily implemented in Dart as, one of the solutions, for multiple inheritances.
Concurrency is another important feature for developing powerful applications. Here, the syntax is also very similar.
String interpolation is the easy and clear way of constructing dynamic contents.
main() {
var h = “Hello”;
final w = “Hello”;
print(‘$h $w’);print(r’no interpolation for $h $w’);
var hello = ‘Adjusting’ ‘String’;
print(hello);print(‘${hello.toUpperCase()}’);
print(‘The answer is ${5 + 10}’);Dart basic code “Hello World”
var multiline = “””
This is
miltiline “””;
print(multiline);
}
Dart Language Tour by dart.com
Dart in action, by Chris Buckett