Page 15 - Dart Language

Chapter 3: Classes

Examples

Creating a class

Classes can be created as follow:

class InputField {
int maxLength;
String name;
}

The class can be instantiated using the new keyword after which the field values will be null by
default.

var field = new InputField();

Field values can then be accessed:

// this will trigger the setter
field.name = "fieldname";

// this will trigger the getter
print(field.name);

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, then

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