Guessing Games - interactive object

gistfile1.js

// Codeacademy.com project, "Guessing Game"
// Simple interactive game, prompting the user to guess a number between 1 and 10, giving clues for the correct answer.

GuessingGame = function(min, max) {
    this.init(min, max);
};

GuessingGame.prototype = {
    minNumber: 1,
    maxNumber: 10,
    secretNumber: null,
    lastMessage: null,
    totalGuesses: 0,
	
	init: function(min, max) {
		this.minNumber = min || this.minNumber;
		this.maxNumber = max || this.maxNumber;
		this.generateNumber();
	},
    
	generateNumber: function() {
		this.secretNumber = Math.floor(this.minNumber + (Math.random() * this.maxNumber));
	},
    
	guess: function(guess) {
        this.totalGuesses++;
        
		if(guess < this.secretNumber) {
			this.message = guess + " is too low. Try again!";
			return false;
		} 
		else if (guess > this.secretNumber) {
			this.message = guess + " is too high. Try again!";
			return false;
		} 
		else {
			this.message = "Congratulations, " + guess + " is correct!";
			return true;
		}
	}
};

var game = new GuessingGame();
var guessResult = false;

do {

	var guessStr = prompt("Guess a number between " + game.minNumber + " and " + game.maxNumber + ":");	

	if(guessStr && !isNaN(guessStr)) {
	        var guessInt = parseInt(guessStr, 10);
		guessResult = game.guess(guessInt);
		console.log(game.message);
	}

} while(false);