Ruby: NoMethodError on call to display method - ruby

Question

Greeting, I just started learning Ruby a few weeks with this noob book titled Computer Science Programming Basics in Ruby. I've practiced the exercises in each chapter, haven't had too many error, but I keep getting this error in a class I wrote up for the tic-tac-toe game in the last chapter. Here is the board.rb class file I made:
class Board
BOARD_MAX_INDEX = 2
EMPTY_POS = ' '
def initialize(current_player)
#current_player = current_player
#board = Array.new(BOARD_MAX_INDEX + 1) {
Array.new(BOARD_MAX_INDEX + 1) { EMPTY_POS }
}
end
end
def display
puts "+------+"
for row in 0..BOARD_MAX_INDEX
print "| "
for col in 0..BOARD_MAX_INDEX
s = #board[row][col]
if s == EMPTY_POS
print col + (row * 3) + 1
else
print s
end
print " | "
end
puts "\n+------+"
end
end
The class runs fine, but this is the error message in irb when I attempt to access
the display method call:
irb(main):004:0> require '/home/nick/board.rb'
=> true
irb(main):005:0> puts "Starting tic-tac-toe..."
Starting tic-tac-toe...
=> nil
irb(main):006:0> players = ['X', 'O']
=> ["X", "O"]
irb(main):007:0> current_player = players[rand(2)]
=> "O"
irb(main):008:0> b = Board.new(current_player)
=> #<Board:0x00000001c64868 #current_player="O", #board=[[" ", " ", " "], [" ", " ", " "], [" ", " ", " "]]>
irb(main):009:0> b.display()
NoMethodError: private method `display' called for #<Board:0x00000001c64868>
from (irb):9
from /usr/bin/irb:12:in `<main>'
Why am I getting this error, what do I have to do to get it to display the board?

Answer 1

You should put the definition of the display method inside the class:
end # of class
def display
...
end
Should be:
def display
...
end
end # of class
Hope it helps.