#MVC based Javascript calculator.

The calculator have buttons for numbers 0-9, as well as ".", "+", "-", "*", "/" and "=". It has a non-user-editable display.

Your implementation should be easily expandable to be a fully functional scientific calculator.

Solution:

• make good use of OO design principles
• function as expected without any defects
• be written using backbone.js
• not be compiled from another source (eg using CoffeeScript)