Object-Oriented JavaScript - Second Edition by Stoyan Stefanov & Kumar Chetan Sharma

Author:Stoyan Stefanov & Kumar Chetan Sharma [Stefanov, Stoyan & Sharma, Kumar Chetan]
Language: eng
Format: epub
Tags: Computers & Technology, Internet & Social Media, Programming, Languages & Tools, Software Design; Testing & Engineering, Object-Oriented Design, Web Development & Design, JavaScript, Web Design, Reference, Web Site Design
Amazon: B00E7NCAYA
Publisher: Packt Publishing
Published: 2013-07-25T21:00:00+00:00

Previously, toString() only returned this.name. Now, in addition to that, there is a check to see whether this.constructor.uber exists and, if it does, call its toString() first. this.constructor is the function itself, and this.constructor.uber points to the parent's prototype. The result is that when you call toString() for a Triangle instance, all toString() methods up the prototype chain are called:

>var my = new Triangle(5, 10); >my.toString(); "Shape, 2D shape, Triangle"

The name of the property uber could've been "superclass" but this would suggest that JavaScript has classes. Ideally it could've been "super" (as in Java), but "super" is a reserved word in JavaScript. The German word "über" suggested by Douglass Crockford, means more or less the same as "super" and, you have to admit, it sounds uber-cool.

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