Dart for Hipsters (for Greg Kennedy) by Chris Strom

Author:Chris Strom
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
ISBN: 978-1-937785-03-1
Publisher: The Pragmatic Bookshelf, LLC (365754)

​​ // Collection methods​​

​​ void forEach(fn) { /* ... */ }​​

​​ int get length() { /* ... */ }​​

​​​​

​​ // Hashable method​​

​​ static String hash() { /* ... */ }​​

​​​​

​​ // EventTarget​​

​​ Events get on() => _on;​​

​​}​​

To be clear, none of this is necessary in Dart, but judicious use of interfaces goes a long way toward improving the readability of code.

7.6 Subclasses

In Dart, we say that a subclass extends its superclass with new functionality. As we will see in Chapter 9, ​Project: Extracting Libraries​, most of a collection’s functionality can be factored out into a HipsterCollection superclass. The Comics subclass then needs to extend HipsterCollection with only a few methods.

​​class Comics extends HipsterCollection {​​

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