Download E-books Dart in Action PDF

By Chris Buckett

Summary

Dart in Action introduces Google's Dart language and gives suggestions and examples displaying tips on how to use it as a practicable substitute for Java and JavaScript in browser-based computer and cellular purposes. It starts off with a swift evaluate of Dart language and instruments, together with beneficial properties like interacting with the browser, non-compulsory typing, sessions, libraries, and concurrency with isolates. when you grasp the center strategies, you are going to flow directly to working Dart at the server and growing unmarried web page HTML5 net applications.

About the Technology

Dart is an online programming language built via Google. It has glossy OO good points, similar to Java or C#, whereas protecting JavaScript's dynamic and useful features. Dart purposes are "transpiled" to JavaScript, they usually run natively in Dart-enabled browsers. With production-quality libraries and instruments, Dart operates on either the buyer and the server for a constant improvement process.

About this Book

Dart in Action introduces the Dart language and teaches you to take advantage of it in browser-based, computer, and cellular purposes. not only a language educational, this publication will get fast into the nitty-gritty of utilizing Dart. such a lot questions that pop up while you are interpreting are replied instant! OO novices will take pleasure in the light velocity within the early chapters. Later chapters take a test-first strategy and inspire you to attempt Dart hands-on.

To make the most of this booklet you will need adventure with HTML and JavaScript?a Java or C# historical past is beneficial yet now not required.

Purchase of the print booklet comes with a suggestion of a unfastened PDF, ePub, and Kindle book from Manning. additionally to be had is all code from the book.

What's Inside

  • Dart from the floor up
  • Numerous code samples and diagrams
  • Creating single-page internet apps
  • Transitioning from Java, C#, or JavaScript
  • Running Dart within the browser and at the server

About the Author

Chris Buckett builds enterprise-scale net functions. He runs Dartwatch.com and is an energetic contributor to the dartlang list.

"Includes a variety of examples of center language positive factors in addition to extra complicated HTML5 features."-;From the Foreword through Seth Ladd, Developer suggest, Google

Table of Contents

PART 1 INTRODUCING DART
  1. Hello Dart
  2. "Hello international" with Dart tools
  3. Building and checking out your personal Dart app
  4. PART 2 center DART
  5. Functional first class services and closures
  6. Understanding libraries and privacy
  7. Constructing sessions and interfaces
  8. Extending periods and interfaces
  9. Collections of richer classes
  10. Asynchronous programming with callbacks and futures
  11. PART three CLIENT-SIDE DART APPS
  12. Building a Dart net app
  13. Navigating offline data
  14. Communicating with different structures and languages
  15. PART four SERVER-SIDE DART
  16. Server interplay with documents and HTTP
  17. Sending, syncing, and storing data
  18. Concurrency with isolates

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Simply because a few async calls have to whole earlier than you will get the consequences string, you can’t simply name getResultsString() and cross its price to a different functionality. as a substitute, you could name getResultsString() within the ultimate then() handler of the ultimate destiny, yet occasionally you furthermore may have to use one other destiny worth. the outcome should be nested futures, that's what you’re attempting to steer clear of with futures within the first position. the subsequent snippet exhibits the matter: At this element, the transform(callback) functionality is available in. It’s just like the chain() functionality in that it returns a destiny. the variation is that chain() expects its callback functionality to come back a destiny, and transform() wraps any price in a destiny, permitting you to come a destiny price as a part of a chain of async procedure calls—even while a few of these process calls aren’t async. directory nine. 10 exhibits transform() in motion: it waits for all 3 profitable numbers to be drawn, passes them to getResultsString(), and instantly wraps the go back price from getResultsString() into one other destiny so that you can use to chain to the following name to formatResultString(), that's utilized by the updateWinningNumbersDiv() functionality. This avoids nesting the decision to formatResultString() within the wait(). then() callback functionality. directory nine. 10. lottery_app. dart: remodeling a nonfuture worth right into a destiny worth destiny values, supported by way of their completers, supply a robust mechanism for writing code that makes use of async APIs in a readable and maintainable demeanour. through chaining async calls with chain() and nonasync calls with transform(), you could combine asynchronous and synchronous code whereas protecting a coherent stream. Many Dart async APIs go back destiny values instead of utilizing callbacks, yet a few nonetheless do use callbacks. during this part, you’ve visible tips to wrap callback APIs reminiscent of getWinningNumber(callback) to come destiny values by means of hiding the callback performance in a wrapper functionality, as a substitute returning a destiny price that’s accomplished whilst the callback itself is named. keep in mind you could wrap async callback API services to come destiny values. the long run value’s then(callback) callback functionality is named whilst the long run has eventually obtained a cost. transform(callback) wraps its callback’s lower back worth in a brand new destiny. chain(callback) expects its callback’s lower back worth to be a destiny. The chain() and transform() callback services are known as whilst the longer term gets its worth but additionally allow you to go back one other destiny. you should use those to construct a series of a number of async and synchronous calls. within the ultimate part, we’ll glance back at unit checking out, which we final mentioned in bankruptcy three, and you’ll see tips on how to unit-test the async library services. nine. four. Unit-testing async APIs Dart’s unit-testing framework enables you to try out your features in a separate script with its personal main() functionality. This script imports the library APIs and assessments some of the items of performance you’ve outfitted. if you happen to write unit exams, you are expecting each one try out to run a few code, whole, and record no matter if that try out handed or failed, reckoning on your expectancies.

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