Add Battleship Game Engine specification Resolves: N/a See also: N/apull/23/head
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7 years ago
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# Battleship Game Engine
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**Tier:** 3-Advanced
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Battleship Game Engine (BGE) implements the classic turn-based board game as a
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package that's separated from any presentation layer. This is a type of
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architectural pattern that useful in many application since it allows
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any number of apps to utilize the same service.
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The BGE itself is invoked through a series of function calls rather than
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through directly coupled end user actions. In this respect using the BGE is
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is similar to using an API or a series of routes exposed by a web server.
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This challenge requires that you develop the BGE and a very thin, text-based
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presentation layer for testing that's separate from the engine itself. Due to
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this the User Stories below are divided two sets - one for the BGE and one
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for the text-based presentation layer.
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## User Stories
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### BGE
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- [ ] Caller can invoke a `startGame()` function to begin a 1-player game. This
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function will generate an 8x8 game board consisting of 3 ships having a width of
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one square and a length of:
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* Destroyer: 2 squares
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* Cruiser: 3 squares
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* Battleship: 4 squares
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`startGame()` will randomly place these ships on the board in any direction and
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will return an array representing ship placement and an array representing
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hits and misses that will be passed to other BGE game functions. For the
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duration of the game these arrays represent the game state and they should NOT
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be modified by the caller.
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- [ ] Caller can invoke a `shoot()` function passing the target row and column
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coordinates, the array representing ship placement, and the array representing
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hits and misses. `shoot()` will return indicators representing if the shot
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resulted in a hit or miss, the number of ships left (i.e. not yet sunk), the
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ship placement array, and an updated hits and misses array.
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Cells in the hits and misses array will contain a space if they have yet
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to be targeted, `O` if they were targeted but no part of a ship was at that
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location, or `X` if the cell was occupied by part of a ship.
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### Text-based Presentation Layer
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- [ ] User can see the hits and misses array displayed as a 2 dimensional
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character represention of the game board returned by the `startGame()` function.
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- [ ] User can be promted to enter the coordinates of a target square on the
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game board.
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- [ ] User can see an updated hits and misses array display after taking a
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shot.
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- [ ] User can see a message after each shot indicating whether the shot
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resulted in a hit or miss.
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- [ ] User can see an congratulations message after the shot that sinks the
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last remaining ship.
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- [ ] User can be prompted to play again at the end of each game. Declining
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to play again stops the game.
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## Bonus features
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### BGE
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- [ ] Caller can specify the number of rows and columns in the game board as
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a parameter to the `startGame()` function.
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- [ ] Caller can invoke a function that returns a Javascript object containing
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metrics for the current game. For example, number of turns played, current
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number of hits and misses, etc.
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- [ ] Caller can specify the current player number in function calls to allow
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1 or two player games.
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### Text-based Presentation Layer
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- TBD
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## Project Board
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You can track your progress by cloning this [TBD](url-goes-here)
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## Useful links and resources
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- [Battleship Game (Wikipedia)](https://en.wikipedia.org/wiki/Battleship_(game))
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- [Battleship Game Rules (Hasbro)](https://www.hasbro.com/common/instruct/battleship.pdf)
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## Example projects
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This YouTube video shows how a text-based
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[Battleship Game](https://www.youtube.com/watch?v=TKksu3JXTTM) is played.
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The following example is provided as a demonstration of the Battleship game
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if it is unfamiliar to you. Remember you are to implement a text based
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presentation layer for testing.
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[Battleship Game by Chris Brody](https://codepen.io/CodifyAcademy/pen/ByBEOz)
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