Download Dart for Hipsters: Fast, Flexible, Structured Code for the by Chris Strom PDF

By Chris Strom

In Dart for Hipsters, you persist with project-based chapters demonstrating real-world difficulties solved with Dart. each one venture serves because the beginning for deeper dialogue of defining positive factors of Dart, resembling its help for practical programming. As you make stronger your realizing of Dart, you’ll circulate directly to extra advanced initiatives which, in flip, spur extra complicated discussions, akin to the best way to keep Dart and JavaScript side-by-side. by way of the top of this e-book, not just will you might have an intensive creation to the language, yet you’ll even have outfitted a whole MVC library from scratch.

Since Dart goals to be generic, you won’t see the standard “Hello, World.” in its place, you leap correct in by way of writing an Ajax-powered software, by way of a extra unique dialogue of Dart’s uncomplicated forms. alongside the way in which, Dart for Hipsters indicates you the way to collect Dart into JavaScript, the right way to use Dart’s basic object-oriented programming procedure, and the way to construct well-factored, simply used and maintained libraries. You’ll see dynamic gains of the language in motion, equivalent to injecting assorted information syncing behaviors for a whole framework with one line of code. better of all, you’ll learn the way Dart makes operating with HTML5 and comparable applied sciences a breeze.

What You Need:

You will want Dartium, a preview unencumber of Chrome with the Dart VM integrated. For many of the examples, you would like both the dart2js software or the Dart Editor to bring together Dart down into JavaScript.

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Additional info for Dart for Hipsters: Fast, Flexible, Structured Code for the Modern Web

Example text

Dart class ComicsCollection implements Collection { // ... dispatch(new CollectionEvent('load', this)); } } For each set of model attributes, we create a new model object, set the model’s collection property to our current collection, and add the model to the collection’s models list. Once that is complete, we dispatch a load event for any object that might be interested in listening. The model does not strictly need to know about the collection (in fact, it should not communicate directly with the collection).

1 Class Is a First-Order Concept Dart’s classical approach to object-oriented programming is a significant, and welcome, departure from JavaScript’s prototype-based approach. Prototypebased languages certainly offer some benefits, but ease of approach is not one of them. As we have seen, Dart classes are introduced with the class keyword. class ComicsCollection { // describe class operations here... } That is all we need in order to define a class in Dart—no fancy constructor functions, no heavy libraries to provide classical classes, just class followed by a class name.

At this point, we have a view object that does not yet fulfill its purpose: rendering to the UI. To actually render the view, a render() method can be defined such that it assigns the innerHTML of the view’s Element el to the result of applying Hipster Views • 49 the template to the collection. In this case, the template does no more than iterate over the entire collection, applying a single comic book template to each model. dart class ComicsView { // ... forEach((comic) { html += _singleComicBookTemplate(comic); }); return html; } _singleComicBookTemplate(comic) { return """

  • ${comic['title']} (${comic['author']}) [delete]
  • """; } } The _singleComicBookTemplate() private method is an interesting little method.

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