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    <p>Game programming in general will test your ability to manage complexity. I find that functional programming encourages you to break problems your solving into smaller pieces.</p> <p>The first thing you want to do is turn your script into a bunch of functions by separating all the different concerns. I know it sounds silly but the very act of doing this will make the code more functional (pun intended.) Your main concern is going to be state management. I used a record to manage the position state and a tuple to manage the running state. As your code gets more advanced you will need objects to manage state cleanly.</p> <p>Try adding more to this game and keep breaking the functions apart as they grow. Eventually you will need objects to manage all the functions.</p> <p>On a game programming note don't change state to something else and then change it back if it fails some test. You want minimal state change. So for instance below I calculate the <code>newPosition</code> and then only change the <code>playerPosition</code> if this future position passes.</p> <pre><code>open System // use a third party vector class for 2D and 3D positions // or write your own for pratice type Pos = {x: int; y: int} with static member (+) (a, b) = {x = a.x + b.x; y = a.y + b.y} let drawBoard map = //clear the console Console.Clear() //send each row of the map to the Console map |&gt; List.iter (printfn "%s") let movePlayer (keyInfo : ConsoleKeyInfo) = match keyInfo.Key with | ConsoleKey.UpArrow -&gt; {x = 0; y = -1} | ConsoleKey.DownArrow -&gt; {x = 0; y = 1} | ConsoleKey.LeftArrow -&gt; {x = -1; y = 0} | ConsoleKey.RightArrow -&gt; {x = 1; y = 0} | _ -&gt; {x = 0; y = 0} let validPosition (map:string list) position = map.Item(position.y).Chars(position.x) = ' ' //clear the square player was standing on let clearPlayer position = Console.SetCursorPosition(position.x, position.y) Console.Write( ' ' ) //draw the square player is standing on let drawPlayer position = Console.SetCursorPosition(position.x, position.y) Console.Write( '@' ) let takeTurn map playerPosition = let keyInfo = Console.ReadKey true // check to see if player wants to keep playing let keepPlaying = keyInfo.Key &lt;&gt; ConsoleKey.Q // get player movement from user input let movement = movePlayer keyInfo // calculate the players new position let newPosition = playerPosition + movement // check for valid move let validMove = newPosition |&gt; validPosition map // update drawing if move was valid if validMove then clearPlayer playerPosition drawPlayer newPosition // return state if validMove then keepPlaying, newPosition else keepPlaying, playerPosition // main game loop let rec gameRun map playerPosition = let keepPlaying, newPosition = playerPosition |&gt; takeTurn map if keepPlaying then gameRun map newPosition // setup game let startGame map playerPosition = drawBoard map drawPlayer playerPosition gameRun map playerPosition //define the map let map = [ " "; " "; " "; " "; " ############################### "; " # # "; " # ###### # "; " # # # # "; " #### #### # # # "; " # # # # # # "; " # # # # # # "; " #### #### ###### # "; " # = # "; " # = # "; " ############################### "; " "; " "; " "; " "; " " ] //initial player position on the map let playerPosition = {x = 8; y = 6} startGame map playerPosition </code></pre>
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