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March 18, 2012 06:29
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Seven Languages in Seven Weeks: Scala, Day 1
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def reduce [A1 >: A] (op: (A1, A1) ⇒ A1): A1 | |
Reduces the elements of this sequence using the specified associative binary operator. | |
The order in which operations are performed on elements is unspecified and may be nondeterministic. | |
Note this method has a different signature than the reduceLeft and reduceRight methods of the trait Traversable. The result of reducing may only be a supertype of this parallel collection's type parameter T. |
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import collection.mutable.MutableList | |
object Marker extends Enumeration { | |
type Marker = Value | |
val EMPTY = Value("_") | |
val X = Value("x") | |
val O = Value("o") | |
} | |
import Marker._ | |
class Board(boardSize: Int) { | |
val board = MutableList.fill(boardSize * boardSize)(EMPTY) | |
def spacer(value: String) = " " * (boardSize.toString.length() - value.length() + 2) | |
override def toString = printBoard ((marker, index) => marker.toString) | |
def printMoves() = printBoard ((marker, index) => if (marker == EMPTY) index.toString else EMPTY.toString) | |
def printBoard(printMarker: (Marker, Int) => String): String = board.zipWithIndex.foldLeft(""){(acc, marker) => | |
val printedMarker = printMarker(marker._1, marker._2) | |
acc + (if (marker._2 > 0 && marker._2 % boardSize == 0) "\n" else "") + printedMarker + spacer(printedMarker) | |
} | |
def placeMarker(index: Int, marker: Marker): Boolean = { | |
if (index >= 0 && index < board.length && board(index) == EMPTY) { | |
board(index) = marker | |
return true | |
} | |
false | |
} | |
def allEqual(elements: MutableList[Marker]) = !elements.contains(EMPTY) && elements.distinct.size == 1 | |
def anyListAllEqual(lists: TraversableOnce[MutableList[Marker]]): Boolean = lists.foldLeft(false)(_ || allEqual(_)) | |
def anyListAllEqual(lists: MutableList[MutableList[Marker]]): Boolean = anyListAllEqual(lists.toIterator) | |
def rows() = board.grouped(boardSize) | |
def cols() = board.zipWithIndex.groupBy(_._2 % boardSize).map(_._2.map(_._1)) | |
def diags() = MutableList( | |
board.zipWithIndex.filter(_._2 % (boardSize + 1) == 0).map(_._1), | |
board.zipWithIndex.filter(value => (value._2 % (boardSize - 1) == 0) && (value._2 > 0) && (value._2 < board.length - 1)).map(_._1) | |
) | |
def boardWon() = anyListAllEqual(rows()) || anyListAllEqual(cols()) || anyListAllEqual(diags()) | |
def boardFull() = board.count(_ == EMPTY) == 0 | |
} | |
val board = new Board(3) | |
var currentMove = O | |
while (!board.boardFull() && !board.boardWon()) { | |
currentMove = if (currentMove == X) O else X | |
println("\nThe board:\n") | |
println(board) | |
println("\nAvailable locations on the board:\n") | |
println(board.printMoves()) | |
print("\nIt's " + currentMove + "'s turn! Enter a location: ") | |
val index = Console.readInt() | |
if (!board.placeMarker(index, currentMove)) { | |
println("Invalid location!") | |
} | |
} | |
println() | |
if (board.boardWon()) { | |
println("Player " + currentMove + " wins!") | |
} else { | |
println("It's a draw!") | |
} | |
println() | |
println(board) |
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The board: | |
_ _ _ | |
_ _ _ | |
_ _ _ | |
Available locations on the board: | |
0 1 2 | |
3 4 5 | |
6 7 8 | |
It's x's turn! Enter a location: 4 | |
The board: | |
_ _ _ | |
_ x _ | |
_ _ _ | |
Available locations on the board: | |
0 1 2 | |
3 _ 5 | |
6 7 8 | |
It's o's turn! Enter a location: 0 | |
The board: | |
o _ _ | |
_ x _ | |
_ _ _ | |
Available locations on the board: | |
_ 1 2 | |
3 _ 5 | |
6 7 8 | |
It's x's turn! Enter a location: 6 | |
The board: | |
o _ _ | |
_ x _ | |
x _ _ | |
Available locations on the board: | |
_ 1 2 | |
3 _ 5 | |
_ 7 8 | |
It's o's turn! Enter a location: 2 | |
The board: | |
o _ o | |
_ x _ | |
x _ _ | |
Available locations on the board: | |
_ 1 _ | |
3 _ 5 | |
_ 7 8 | |
It's x's turn! Enter a location: 1 | |
The board: | |
o x o | |
_ x _ | |
x _ _ | |
Available locations on the board: | |
_ _ _ | |
3 _ 5 | |
_ 7 8 | |
It's o's turn! Enter a location: 8 | |
The board: | |
o x o | |
_ x _ | |
x _ o | |
Available locations on the board: | |
_ _ _ | |
3 _ 5 | |
_ 7 _ | |
It's x's turn! Enter a location: 5 | |
The board: | |
o x o | |
_ x x | |
x _ o | |
Available locations on the board: | |
_ _ _ | |
3 _ _ | |
_ 7 _ | |
It's o's turn! Enter a location: 3 | |
The board: | |
o x o | |
o x x | |
x _ o | |
Available locations on the board: | |
_ _ _ | |
_ _ _ | |
_ 7 _ | |
It's x's turn! Enter a location: 7 | |
Player x wins! | |
o x o | |
o x x | |
x x o |
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See Seven Languages in Seven Weeks: Scala, Day 1 for more info.