Is this really the only way to do this???

objectMerge.js

var object1 = { firstName: 'Luc', lastName: 'Perkins' };
var object2 = { age: 31, hobbies: ['singing', 'guitar', 'history', 'philosophy', 'programming']};

for (key in object2) {
  object1[key] = object2[key];
}

// The result
{ firstName: 'Luc',
  lastName: 'Perkins',
  age: 31,
  hobbies:
   [ 'singing',
     'guitar',
     'history',
     'philosophy',
     'programming' ] }