By Chris Buckett
About the Technology
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.
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.
- Dart from the floor up
- Numerous code samples and diagrams
- Creating single-page internet apps
- 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
- Hello Dart
- "Hello international" with Dart tools
- Building and checking out your personal Dart app
- Functional first class services and closures
- Understanding libraries and privacy
- Constructing sessions and interfaces
- Extending periods and interfaces
- Collections of richer classes
- Asynchronous programming with callbacks and futures
- Building a Dart net app
- Navigating offline data
- Communicating with different structures and languages
- Server interplay with documents and HTTP
- Sending, syncing, and storing data
- Concurrency with isolates
PART 2 center DART
PART three CLIENT-SIDE DART APPS
PART four SERVER-SIDE DART
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Extra info for Dart in Action
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.