JavaScript prototype pattern.

prototype.js

(function () {
  'use strict';
  
  var proto
    , bob
    , alice
    , bobby
    ;

  function Person(name) {
    if ( !(this instanceof Person) ) {
      return Person.create(name);
    }
    this.name = name || "(name tag fell off)";
  }

  proto = Person.prototype;

  proto.greet = function (other) {
    var me = this
      , greetee = other.name || "Someone I don't know"
      ;

    console.log('Hello ' + greetee + ', my name is ' + me.name);
  };
  Person.create = function (a, b, c) {
    return new Person(a, b, c);
  };

  bob = new Person();
  alice = Person.create('Alice');
  bobby = Person('Bobby Tables'); // protection from throwing an e from a lack of thisness
  bob.greet(alice);
}());