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Paul Fogarty. Have something to tell us about this article? Here are some more:. To attach a message to an assertion, add a string as the second argument to assert optionally with a trailing comma :.
The first argument to assert can be any expression that resolves to a boolean value. Your Dart code can throw and catch exceptions.
Exceptions are errors indicating that something unexpected happened. Methods do not declare which exceptions they might throw, and you are not required to catch any exceptions.
Dart provides Exception and Error types, as well as numerous predefined subtypes. You can, of course, define your own exceptions. However, Dart programs can throw any non-null object—not just Exception and Error objects—as an exception.
Catching, or capturing, an exception stops the exception from propagating unless you rethrow the exception. Catching an exception gives you a chance to handle it:.
To handle code that can throw more than one type of exception, you can specify multiple catch clauses. If the catch clause does not specify a type, that clause can handle any type of thrown object:.
As the preceding code shows, you can use either on or catch or both. Use on when you need to specify the exception type. Use catch when your exception handler needs the exception object.
You can specify one or two parameters to catch. The first is the exception that was thrown, and the second is the stack trace a StackTrace object.
To partially handle an exception, while allowing it to propagate, use the rethrow keyword. To ensure that some code runs whether or not an exception is thrown, use a finally clause.
If no catch clause matches the exception, the exception is propagated after the finally clause runs:. The finally clause runs after any matching catch clauses:.
Learn more by reading the Exceptions section of the library tour. Dart is an object-oriented language with classes and mixin-based inheritance.
Every object is an instance of a class, and all classes descend from Object. Mixin-based inheritance means that although every class except for Object has exactly one superclass, a class body can be reused in multiple class hierarchies.
Extension methods are a way to add functionality to a class without changing the class or creating a subclass. Objects have members consisting of functions and data methods and instance variables , respectively.
Use a dot. You can create an object using a constructor. Constructor names can be either ClassName or ClassName. For example, the following code creates Point objects using the Point and Point.
The following code has the same effect, but uses the optional new keyword before the constructor name:.
Some classes provide constant constructors. To create a compile-time constant using a constant constructor, put the const keyword before the constructor name:.
Within a constant context , you can omit the const before a constructor or literal. For example, look at this code, which creates a const map:.
You can omit all but the first use of the const keyword:. If a constant constructor is outside of a constant context and is invoked without const , it creates a non-constant object :.
The rest of this section shows how to implement classes. All uninitialized instance variables have the value null.
All instance variables generate an implicit getter method. Non-final instance variables also generate an implicit setter method.
For details, see Getters and setters. If you initialize an instance variable where it is declared instead of in a constructor or method , the value is set when the instance is created, which is before the constructor and its initializer list execute.
Declare a constructor by creating a function with the same name as its class plus, optionally, an additional identifier as described in Named constructors.
The most common form of constructor, the generative constructor, creates a new instance of a class:. The this keyword refers to the current instance.
The pattern of assigning a constructor argument to an instance variable is so common, Dart has syntactic sugar to make it easy:. The default constructor has no arguments and invokes the no-argument constructor in the superclass.
A subclass that declares no constructors has only the default no argument, no name constructor. Use a named constructor to implement multiple constructors for a class or to provide extra clarity:.
If you want a subclass to be created with a named constructor defined in the superclass, you must implement that constructor in the subclass.
If an initializer list is also being used, it executes before the superclass is called. In summary, the order of execution is as follows:. Specify the superclass constructor after a colon : , just before the constructor body if any.
In the following example, the constructor for the Employee class calls the named constructor for its superclass, Person. Click Run to execute the code.
Because the arguments to the superclass constructor are evaluated before invoking the constructor, an argument can be an expression such as a function call:.
Besides invoking a superclass constructor, you can also initialize instance variables before the constructor body runs.
Separate initializers with commas. During development, you can validate inputs by using assert in the initializer list. Initializer lists are handy when setting up final fields.
The following example initializes three final fields in an initializer list. If your class produces objects that never change, you can make these objects compile-time constants.
To do this, define a const constructor and make sure that all instance variables are final. For details, see the section on using constructors.
For example, a factory constructor might return an instance from a cache, or it might return an instance of a subtype. In the following example, the Logger factory constructor returns objects from a cache, and the Logger.
Instance methods on objects can access instance variables and this. The distanceTo method in the following sample is an example of an instance method:.
Operators are instance methods with special names. Dart allows you to define operators with the following names:. An operator declaration is identified using the built-in identifier operator.
Recall that each instance variable has an implicit getter, plus a setter if appropriate. You can create additional properties by implementing getters and setters, using the get and set keywords:.
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