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Bradley Brooks. Andy Hamilton. Scott Baker. For example, say you create an interface for caching an object:. You discover that you want a string-specific version of this interface, so you create another interface:.
Generic types can save you the trouble of creating all these interfaces. Instead, you can create a single interface that takes a type parameter:.
In this code, T is the stand-in type. List, set, and map literals can be parameterized. Here is an example of using typed literals:.
Dart generic types are reified , which means that they carry their type information around at runtime. For example, you can test the type of a collection:.
When implementing a generic type, you might want to limit the types of its parameters. You can do this using extends. Specifying any non- SomeBaseClass type results in an error:.
A newer syntax, called generic methods , allows type arguments on methods and functions:. For more information about generics, see Using Generic Methods.
The import and library directives can help you create a modular and shareable code base. Use import to specify how a namespace from one library is used in the scope of another library.
For example, Dart web apps generally use the dart:html library, which they can import like this:. The only required argument to import is a URI specifying the library.
For built-in libraries, the URI has the special dart: scheme. For other libraries, you can use a file system path or the package: scheme. The package: scheme specifies libraries provided by a package manager such as the pub tool.
If you import two libraries that have conflicting identifiers, then you can specify a prefix for one or both libraries.
For example, if library1 and library2 both have an Element class, then you might have code like this:. Deferred loading also called lazy loading allows a web app to load a library on demand, if and when the library is needed.
Here are some cases when you might use deferred loading:. To lazily load a library, you must first import it using deferred as. In the preceding code, the await keyword pauses execution until the library is loaded.
For more information about async and await , see asynchrony support. You can invoke loadLibrary multiple times on a library without problems.
The library is loaded only once. See Create Library Packages for advice on how to implement a library package, including:.
Dart libraries are full of functions that return Future or Stream objects. The async and await keywords support asynchronous programming, letting you write asynchronous code that looks similar to synchronous code.
Code that uses async and await is asynchronous, but it looks a lot like synchronous code. To use await , code must be in an async function—a function marked as async :.
Use try , catch , and finally to handle errors and cleanup in code that uses await :. You can use await multiple times in an async function. For example, the following code waits three times for the results of functions:.
This Future object indicates a promise to return an object. The value of await expression is that returned object. The await expression makes execution pause until that object is available.
If you get a compile-time error when using await , make sure await is in an async function. An async function is a function whose body is marked with the async modifier.
Adding the async keyword to a function makes it return a Future. For example, consider this synchronous function, which returns a String:.
If you change it to be an async function—for example, because a future implementation will be time consuming—the returned value is a Future:.
Dart creates the Future object if necessary. For an interactive introduction to using futures, async , and await , see the asynchronous programming codelab.
The value of expression must have type Stream. Execution proceeds as follows:. To stop listening to the stream, you can use a break or return statement, which breaks out of the for loop and unsubscribes from the stream.
If you get a compile-time error when implementing an asynchronous for loop, make sure the await for is in an async function.
For more information about asynchronous programming, in general, see the dart:async section of the library tour. When you need to lazily produce a sequence of values, consider using a generator function.
Dart has built-in support for two kinds of generator functions:. To allow an instance of your Dart class to be called like a function, implement the call method.
In the following example, the WannabeFunction class defines a call function that takes three strings and concatenates them, separating each with a space, and appending an exclamation.
Most computers, even on mobile platforms, have multi-core CPUs. To take advantage of all those cores, developers traditionally use shared-memory threads running concurrently.
However, shared-state concurrency is error prone and can lead to complicated code. Instead of threads, all Dart code runs inside of isolates.
In Dart, functions are objects, just like strings and numbers are objects. A typedef , or function-type alias , gives a function type a name that you can use when declaring fields and return types.
A typedef retains type information when a function type is assigned to a variable. Type information is lost when assigning f to compare.
If we change the code to use explicit names and retain type information, both developers and tools can use that information. Because typedefs are simply aliases, they offer a way to check the type of any function.
Use metadata to give additional information about your code. A metadata annotation begins with the character , followed by either a reference to a compile-time constant such as deprecated or a call to a constant constructor.
Two annotations are available to all Dart code: deprecated and override. For examples of using override , see Extending a class. You can define your own metadata annotations.
Metadata can appear before a library, class, typedef, type parameter, constructor, factory, function, field, parameter, or variable declaration and before an import or export directive.
You can retrieve metadata at runtime using reflection. Multi-line comments can nest. Inside a documentation comment, the Dart compiler ignores all text unless it is enclosed in brackets.
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