Like Ruby, Dart is a purely object-oriented (OO) language, so every variable in Dart points to an object and there are no primitive types like in Java or C#. Every variable is an instance of a class (that inherits from the Object
base class) and has a type and, when uninitialized, has the null
value. However, for easy use, Dart has built-in types for the numbers, Booleans, and Strings defined in dart:core
that look and behave like primitive types; that is, they can be made with literal values and have the basic operations that you would expect (to make it clear, we will use full typing in builtin_types.dart
, but we could have used var
as well).
A String (notice the capital) is a sequence of Unicode (UTF-16) characters, for example:
String country = "Egypt"; String chineseForWorld = '世界';
They can be indicated by paired '
or "
(use ""
when the string contains '
and vice versa). Adjacent string literals are concatenated. If you need multiline strings, use triple...