JavaScript Inheritance and Object Programming

Coding Tutorial, Chapter 4c

Composition: Add Borders Defaults

© 21 July, 2013, Martin Rinehart

Results

You can see your defaults on your boxes.

Code

You can put constants, such as a DEFAULTS object, anywhere in the source. We like ours at the top (where it's easy to find when the designer changes his/her mind). We also like styles that really stand out (but only during development).

ns.DEFAULTS = { borders: { bcolor: 'red', bstyle: 'double', bwidth: 5 } }

Add a statement to your Box.init() to use the defaults. Ours comes just after the parameters are copied into properties.

new_box.borders = new ns.Borders( ns.DEFAULTS.borders.bwidth, ns.DEFAULTS.borders.bstyle, ns.DEFAULTS.borders.bcolor );

Feedback: Martin Rinehart at gmail dot com.

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