I am writing a Chess program in Ruby. I'm attempting to create a Board of 64 Square objects, which will keep track of piece_on_square, x position, y position, and coordinates. The coordinates variable will hold the letter-number combo of that particular space, such as 'a8' or 'a1'. However, I am having trouble generating these letter-number combinations, using my #assign_coordinates method.
Here's what I have:
class Square
attr_accessor :piece_on_square, :x, :y, :coordinates
def initialize(piece_on_square=nil, x=nil, y=nil, coordinates=nil)
@piece_on_square = piece_on_square
@x = x
@y = y
@coordinates = coordinates
end
end
class Board
def initialize
@square_array = Array.new(64)
setup_new_board
assign_coordinates
end
def setup_new_board
@square_array.each_with_index do |n, index|
square_array[index] = Square.new
end
end
def assign_coordinates
letters = ["a", "b", "c", "d", "e", "f", "g", "h"]
numbers = [1, 2, 3, 4, 5, 6, 7, 8]
@square_array.each do |i|
letters.each do |x|
numbers.each do |n|
i.coordinates = "#{x}#{n}"
end
end
end
end
When I do this, all of the coordinates are listed as "h8". For example, when looking in IRB, @square_array[0] returns:
=> #<Square:0x007fd74317a0a8 @piece_on_square=nil, @x=nil, @y=nil, @coordinates="h8">
What am I doing wrong? How can I properly create and name each of these Square objects?
For each square, you are (re-)assigning each values from "a1" to "h8" in turn, ending up assigning "h8".
To do it correctly, you can do like this:
class Board
Letters = ("a".."h").to_a
Numbers = ("1".."8").to_a
def initialize
@square_array = Array.new(64){Square.new}
assign_coordinates
end
def assign_coordinates
Letters.product(Numbers).zip(@square_array){|a, e| e.coordinates = a.join}
end
end
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