More Memory!

Make sure your Memory is bug-free

You should play a couple of rounds of Memory to make sure that your implementation doesn't have any bugs. Make sure you test the following special cases:

If the user clicks on a card, then clicks on the same card, you should show a message saying that s/he can't click on the same card twice in the same turn.
If the user clicks on a "matched" card, you should show a message saying that s/he can't click on a card that has already been matched.
When the user has made all the matches, s/he should be able to play a new game of Memory. "New game" means that the cards should be randomly assigned again -- no one wants to play the same game twice!

Make sure that your code is clean

When you hand in a program in a class, you are graded not only on how well your program works but also on how "clean" (or neat) your code is. You should check for the following:

Your code is properly indented. For example, everything within an if statement should be indented slightly from the if (whatever) line. Hint: if you hit the Tab key in XEmacs, the line that the cursor is on will be indented properly.
You have comments where they are needed. Some general rules are that you should have a comment at the beginning of every function describing what that function does, you should comment pieces of code that are particularly difficult to understand, and you should have a comment at the very beginning of the program explaining what the program does. The idea is that someone looking through your code should be able to understand immediately how your program does what it does. Here is the syntax for comments in JavaScript:
```
// This is a single line comment.

/** This is a multiple line comment.
  * It's good style to put an * at the beginning of every line, 
  * as I have done.
  */
```

Extra Credit

If your code is clean and bug-free, here are some "extras" that you can put in to your Memory game. In a normal class, these extras would get you some extra credit:

Keep track of the player's score. How many tries does it take him/her to make all the matches? Let them know when they beat their old best score.
Get the player's name and make your messages to him/her personalized. (For example, "Congratulations, Lisa! You won!") This will require putting a text box onto your HTML document. See the HTML tutorial or talk to Lisa or Catherine to find out how to do this.
Make your game a two-player game. Keep track of the scores of both players, and tell the players who won after the last match is made.
Make up your own extra credit! Just be sure to run your idea past Lisa or Catherine first.

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