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function chainify(obj) {
    Object.keys(obj).forEach(function(key){
        var member = obj[key];
        if(typeof member === "function" && !/\breturn\b/.test(member)){
            obj[key] = function() {
                member.apply(this, arguments);
                return this;
            }
        }
    });
}

// define the class
var Kitten = function() {
  this.name = 'Garfield';
  this.color = 'brown';
  this.gender = 'male';
};

Kitten.prototype.setName = function(name) {
  this.name = name;
};

Kitten.prototype.setColor = function(color) {
  this.color = color;
};

Kitten.prototype.setGender = function(gender) {
  this.gender = gender;
};

Kitten.prototype.save = function() {
  console.log(
    'saving ' + this.name + ', the ' + this.color + ' ' + this.gender + ' kitten...'
  );

  // save to database here...
};

Kitten.prototype.sayHi = function(name) {
     return "Hi " + name + "! My name is " + this.name + ".";   
};

chainify(Kitten.prototype);

var bob = new Kitten()
  .setName('Bob')
  .setColor('black')
  .setGender('male')
  .save();

console.log(bob.sayHi("Tom"));