Idiot Calculator Improved --- Computer Science --- Haas

Write a JavaScript program to improve Haas' Idiot Calculator: IdiotCalc

The Idiot Calculator already has buttons to add 1 and subtract 1, WOW! 

You must add the following buttons and functions to the calculator:

New buttons on the calculator

• Double - This button will multiply the current value by 2.
• Absolute - This button takes the absolute value of the current total.
• Factorial - Takes the factorial: (example 5 factorial is 5x4x3x2x1 = 120)
• Sqrt - This button takes the square root of the current value.
• Round - This button rounds the current value to the nearest whole number.
• Odd/Even - States if the value is ODD or EVEN, but does Not change the value.
• Digits - States how many digits are in the number, but does not change the value. (example: if value is -652.43 "The number of digits is 5."