dictionary object
This method will attempt to delete a particular key and value pair.
bool delete(string key)
Parameters:
key
The key to look for.
Return value:
true on success, false on failure.
Remarks:
None.
Example:

    dictionary game_board; // Declare our dictionary.

    void main()
    {
    // Set our values.
    game_board.set("1", 2);
    game_board.set("2", 4);
    game_board.delete("1");
    }