MIN_VALUE / MAX_VALUE Examples

gistfile1.js

/**
 *  class Person
 *  
 *  An example use case for Number.MIN_VALUE and Number.MAX_VALUE.
 **/
var Person = Class.create((function() {
	var _age = Number.MIN_VALUE, _name;
	return {
		/**
		 *  new Person(name[, age]);
		 **/
		initialize: function(name, age) {
			_name = name;
			if (!Object.isUndefined(age)) {
				_age = age; // Use given age, if found.
			}
		},
		speak: function(message) {
			console.log(_name + ": " + message);
			return this;
		},
		speakYourAge: function() {
			var msg = "";
			switch(true) {
				case _age == Number.MIN_VALUE:
					msg = "I'm not born yet."; break;
				case _age == Number.MAX_VALUE:
					msg = "I'm dead."; break;
				default: msg = "I am #{years} years old.".interpolate({years: _age});
			}
			this.speak(msg);
			return this;
		},
		live: function() {
			_age = 0;
			this.speak("Huzzah! I'm alive!");
			return this;
		},
		age: function() {
			if (_age == Number.MIN_VALUE) {
				this.speak("I can't age. I've not been born yet.")
			} else if (_age == Number.MAX_VALUE) {
				this.speak("I can't age. I'm dead.")
			} else {
				_age++;
				if (_age == Number.MAX_VALUE) this.die();
				this.speakYourAge();
			}
			return this;
		},
		die: function() {
			_age = Number.MAX_VALUE;
			this.speak("Gack! I'm dying!");
			return this;
		},
		isAlive: function() {
			var alive =  _age != Number.MIN_VALUE && _age != Number.MAX_VALUE;
			this.speak((alive) ? "Yes, I am alive." : "No, I am not alive.");
			return alive;
		},
		toString: function() { return "[object Person]"; }
	}
})());

// Create Alex
var alex = new Person("Alex");

// Check if he's alive.
alex.isAlive();

// Live, age, etc
alex.speakYourAge()
	.live().speakYourAge()
	.age().age().age().isAlive();

// Die, then check if he's alive.
alex.die().speakYourAge().isAlive();