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Dart Members


A class can have members.
Instance variables can be declared with/without type annotations, and optionally initialized. Uninitialised members have the value of null, unless set to another value by the constructor.

class Foo {
 var member1;
 int member2;
 String member3 = "Hello world!";
}

Class variables are declared using the static keyword.

class Bar {
 static var member4;
 static String member5;
 static int member6 = 42;
}

If a method takes no arguments, is fast, returns a value, and doesn't have visible side-effects, thena getter method can be used:

class Foo {
 String get bar {
 var result;
 // ...
 return result;
 }
}

Getters never take arguments, so the parentheses for the (empty) parameter list are omitted both for declaring getters, as above, and for calling them, like so:

main() {
 var foo = new Foo();
 print(foo.bar); // prints "bar"
}

There are also setter methods, which must take exactly one argument:

class Foo {
 String _bar;
 String get bar => _bar;
 void set bar(String value) {
 _bar = value;
 }
}

The syntax for calling a setter is the same as variable assignment:

main() {
 var foo = new Foo();
 foo.bar = "this is calling a setter method";
}


Conclusion

In this page (written and validated by ) you learned about Dart Members . What's Next? If you are interested in completing Dart tutorial, your next topic will be learning about: Dart Constructors.



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