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Mastering DART

By : Sergey Akopkokhyants

4.6 (5)

Mastering DART

4.6 (5)

By: Sergey Akopkokhyants

Overview of this book

If you are an application developer who has experience with Dart and want to develop reusable and robust code in Dart, then this book is for you. You are expected to have a basic knowledge of core elements and applications.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Beyond Dart's Basics

1. Beyond Dart's Basics

Modularity and a namespace

Functions and closures in different scopes

Classes and mixins

Methods and operators

Summary

2. Advanced Techniques and Reflection

2. Advanced Techniques and Reflection

Generics

Errors versus exceptions

Annotations

Reflection

Summary

3. Object Creation

3. Object Creation

Creating an object

Summary

4. Asynchronous Programming

4. Asynchronous Programming

Call-stack architectures versus event-driven architectures

Future

Zones

Isolates

Summary

5. The Stream Framework

5. The Stream Framework

Why you should use streams

Single-subscription streams versus broadcast streams

An overview of the stream framework API

Summary

6. The Collection Framework

6. The Collection Framework

A Dart collection framework

Ordering of elements

Collections and generics

The collection class hierarchy

The Iterable interface

The Iterable interface

BidirectionalIterator

The collection classes

Unmodifiable collections

Choosing the right collection

Summary

7. Dart and JavaScript Interoperation

7. Dart and JavaScript Interoperation

Interoperation at a glance

The dart:js library

Type conversion

JsObject and instantiation

JsFunction and the this keyword

Dart with jQuery

Summary

8. Internalization and Localization

8. Internalization and Localization

The key principles

The Intl library

Internationalizing your web application

Extracting messages

Using Google Translator Toolkit

Using translated messages

Summary

9. Client-to-server Communication

9. Client-to-server Communication

Communication at a glance

Hypertext Transfer Protocol

AJAX polling request

AJAX long polling request

WebSocket

Summary

10. Advanced Storage

10. Advanced Storage

Cookies

Web Storage

Web SQL

IndexedDB

Summary

11. Supporting Other HTML5 Features

11. Supporting Other HTML5 Features

The notification APIs

The native drag-and-drop APIs

The geolocation APIs

Canvas

Summary

12. Security Aspects

12. Security Aspects

Web security

Securing a server

Securing a client

Security best practices

Summary

Index

Index

Zones

Often, a program generates an uncaught exception and terminates the execution. The commonly occurring exceptions in the program means that the code is broken and must be fixed. However, sometimes exceptions may happen due to errors in communication, hardware faults, and so on. The following is an example of the HTTP server, which is used to demonstrate this problem:

import 'dart:io';

main() {
  runServer();
}

runServer() {
  HttpServer
  .bind(InternetAddress.ANY_IP_V4, 8080)
  .then((server) {
    server.listen((HttpRequest request) {
      request.response.write('Hello, world!');
      request.response.close();
    });
  });
}

The code in the main function can be terminated due to uncaught errors that may happen in the runServer function. Termination of the program under those circumstances can be undesirable.

So, how can this problem be solved? We wrap our code within a try/catch block to catch all the uncaught exceptions and it works perfectly, as shown in...

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Programming languages

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