Initial implementation of Rock, Paper, Scissors in Lua

74_Rock_Scissors_Paper/lua/rockscissors.lua

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+function getInput(prompt)
+    io.write(prompt)
+    io.flush()
+    local input = io.read("l") 
+    if not input then  --- test for EOF
+        print("GOODBYE")
+        os.exit(0)
+    end
+    return input
+end
+
+function has_key(table, key)
+   return table[key]~=nil
+end
+ 
+function choice(prompt, table)
+   resp = getInput(prompt)
+   while not has_key(table, resp) do
+      print("INVALID.")
+      resp = getInput(prompt)
+   end
+   return resp
+end
+
+function playGame(n)
+   local computerWins = 0
+   local humanWins = 0
+   itemChoices = {
+        ["1"] = "PAPER",
+        ["2"] = "SCISSORS",
+        ["3"] = "ROCK",
+   }
+   print("GAME NUMBER " .. n)
+
+   math.randomseed(os.time())
+   computerChoice = math.random(1,3)
+  
+   print(computerChoice)
+   humanChoice = choice("3=ROCK...2=SCISSORS...1=PAPER\n1...2...3...WHAT'S YOUR CHOICE? ", itemChoices)
+   humanChoice = tonumber(humanChoice)
+   print("THIS IS MY CHOICE...")
+
+   print("... " .. itemChoices[tostring(computerChoice)])
+
+   if computerChoice == humanChoice then 
+      print("TIE GAME.  NO WINNER.")
+   elseif computerChoice > humanChoice then
+      if humanChoice ~=1 or computerChoice ~= 3 then 
+         computerWins = 1
+         print("WOW!  I WIN!!!")
+      else
+         humanWins = 1
+         print("YOU WIN!!!")
+      end
+   elseif computerChoice == 1 then
+      if humanChoice ~= 3 then
+         humanWins = 1
+         print("YOU WIN!!!")
+      else
+         computerWins = 1
+         print("WOW! I WIN!!!")
+      end
+   end
+   return computerWins, humanWins
+end
+
+local games = 0
+while games == 0 or games >= 11 do
+   resp = getInput("HOW MANY GAMES? ")
+   
+   assert(tonumber(resp))
+   games = tonumber(resp)
+   if games < 11 then break end
+   
+   print("SORRY, BUT WE AREN'T ALLOWED TO PLAY THAT MANY.")
+end
+
+totalComputerWins = 0
+totalHumanWins = 0
+
+for n=1, games, 1 do
+   computerWins, humanWins = playGame(n)
+   totalComputerWins = totalComputerWins + computerWins
+   totalHumanWins = totalHumanWins + humanWins
+end
+
+print("HERE IS THE FINAL GAME SCORE:")
+print("I HAVE WON " .. totalComputerWins .. " GAME(S).")
+print("YOU HAVE WON " .. totalHumanWins .." GAME(S).")
+print("AND " .. games-(totalComputerWins+totalHumanWins) .. " GAME(S) ENDED IN A TIE.")
+print("THANKS FOR PLAYING!!")