a very simple calculator. basic arithmetic only. try it with your keyboard!
my work from The Odin Project: http://www.theodinproject.com/javascript-and-jquery/on-screen-calculator
try it out live: http://htmlpreview.github.io/?https://github.com/NerdDiffer/simpleCalculator/blob/master/pub/index.html
###notable keyboard shortcuts:
- 'delete' key: clear the screen and start a new expression
- 'enter' key: evaluate your expression
- '%' or 'Shift + 5': modulus operation
- '(' or 'Shift + 9': left parenthesis
- ')' or 'Shift + 0': right parenthesis