Rock-paper-scissors: Difference between revisions

=={{header|Ruby}}==

<lang ruby>class RockPaperScissorsGame

def initialize()

@pieces = %w[rock paper scissors]

@beats = {

'rock' => 'paper',

'paper' => 'scissors',

'scissors' => 'rock',

}

@plays = {

'rock' => 1,

'paper' => 1,

'scissors' => 1,

}

@score = [0, 0]

play

end

def humanPlay()

answer = nil

loop do

print "\nYour choice: #@pieces? "

answer = STDIN.gets.strip.downcase

next if answer.empty?

if idx = @pieces.find_index {|piece| piece.match(/^#{answer}/)}

answer = @pieces[idx]

break

else

puts "invalid answer, try again"

end

end

print "H: #{answer}, "

answer

end

def computerPlay()

total = @plays.values.reduce(:+)

r = rand(total) + 1

sum = 0

humans_choice = nil

@pieces.each do |piece|

sum += @plays[piece]

if r <= sum

humans_choice = piece

break

end

end

choice = @beats[humans_choice]

print "C: #{choice} => "

choice

end

def play

loop do

h = humanPlay

c = computerPlay

# only update the human player's history after the computer has chosen

@plays[h] += 1

if h == c

puts "draw"

elsif h == @beats[c]

puts "Human wins"

@score[0] += 1

else

puts "Computer wins"

@score[1] += 1

end

puts "score: human=#{@score[0]}, computer=#{@score[1]}"

end

end

end

game = RockPaperScissorsGame.new</lang>

sample game where human always chooses rock:

<pre style="height: 40ex; overflow: scroll">Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: rock => draw

score: human=0, computer=0

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=1

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: rock => draw

score: human=0, computer=1

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=2

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=3

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=4

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=5

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=6

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=7

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=8

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=9

Your choice: ["rock", "paper", "scissors"]? r

H: rock, C: paper => Computer wins

score: human=0, computer=10</pre>