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3 - The mutability of objects.js

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function displayError(message) {

displayError.numTimesExecuted++;

alert(message);

};

displayError.numTimesExecuted = 0;

/* Class Person. */

function Person(name, age) {

this.name = name;

this.age = age;

}

Person.prototype = {

getName: function() {

return this.name;

},

getAge: function() {

return this.age;

}

}

/* Instantiate the class. */

var alice = new Person('Alice', 93);

var bill = new Person('Bill', 30);

/* Modify the class. */

Person.prototype.getGreeting = function() {

return 'Hi ' + this.getName() + '!';

};

/* Modify a specific instance. */

alice.displayGreeting = function() {

alert(this.getGreeting());

}