Speaking JavaScript by Axel Rauschmayer
Author:Axel Rauschmayer
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Programming Languages / JavaScript
ISBN: 9781449364984
Publisher: O’Reilly Media
Published: 2014-02-23T16:00:00+00:00
function StrictColor(name) { 'use strict'; this.name = name; } var c = StrictColor('green'); // TypeError: Cannot set property 'name' of undefined
Returning arbitrary objects from a constructor
In many object-oriented languages, constructors can produce only direct instances. For example, consider Java: let’s say you want to implement a class Expression that has the subclasses Addition and Multiplication. Parsing produces direct instances of the latter two classes. You can’t implement it as a constructor of Expression, because that constructor can produce only direct instances of Expression. As a workaround, static factory methods are used in Java:
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