Cards, Closures, and Code, Oh My!

1. Create a Card(suit, number) constructor with data members suit and number. Make it so that it is impossible to change the suit and number of a card (yes, you will need to use closures). Create the following functions for this prototype:
   1. toString(): returns a string representation of the card, for example: AD, 4C, 2D.
   2. equal(otherCard): returns true if this card equals otherCard.
   3. cmp(otherCard): returns -1 if the number of this card is less than otherCard, 1 if it is greater, and 0 if they are the same.
2. Create Deck constructor with data members cards which is initially an empty array. It should also have the following member functions:
   1. shuffle: shuffles the cards. Extra credit: what is the minimum number of swaps required to ensure that a deck is shuffled?
   2. addCards(x): takes as input x which can either be an array of Cards, or a Deck, or just a Card, and adds it to the deck.
   3. deal(): returns a card from the top of the deck and removes it from the deck.