/**
 * A generic class has a similar shape to a generic interface. 
 * Generic classes have a generic type parameter list in angle brackets (<>) following the name of the class.
 */

class GenericNumber<T> {
    zeroValue: T;
    add: (x: T, y: T) => T;
}

var myGenericNumber = new GenericNumber<number>();
myGenericNumber.zeroValue = 0;
myGenericNumber.add = function(x, y) { return x + y; };