extensions

Extensions Challenge

From the Handbook:

1. Extend the Integer protocol with an isEven() method that returns true if a number is even and false if it’s odd.

2. Extend String with a length property that returns the number of characters it has.

3. Extend UIView so that it has a bounceOut(duration:) method that uses animation to scale its size down to 0.0001 over a specified number of seconds.

4. Extend Array so that it has a mutating remove(item:) method. Tip: you will need to add the Comparable constraint to make this work!