JavaScript Inheritance and Object Programming

Coding Tutorial, Chapter 4b

Composition: Get Styles from Borders

© 21 July, 2013, Martin Rinehart

Results

We use the simple alert() method (the same one we used when we created the Borders class) to test both our get_styles() method and our new toString().

Code

The new get_styles() method is an instance method. That means it goes into the prototype.

It also provides a new way of looking at the object, which we use in our toString() method.

ns.Borders.prototype.get_styles = function () { var border = this; return {borderColor: border.bcolor, borderStyle: border.bstyle, borderWidth: border.bwidth + 'px'}; } ns.Borders.prototype.toString = function () { return 'Borders{' + 'get_styles()=' + ns.o2s( this.get_styles() ) + '}'; }

Feedback: Martin Rinehart at gmail dot com.

# # #