var contacts = [
  {
      "firstName": "Akira",
      "lastName": "Laine",
      "number": "0543236543",
      "likes": ["Pizza", "Coding", "Brownie Points"]
  },
  {
      "firstName": "Harry",
      "lastName": "Potter",
      "number": "0994372684",
      "likes": ["Hogwarts", "Magic", "Hagrid"]
  },
  {
      "firstName": "Sherlock",
      "lastName": "Holmes",
      "number": "0487345643",
      "likes": ["Intriguing Cases", "Violin"]
  },
  {
      "firstName": "Kristian",
      "lastName": "Vos",
      "number": "unknown",
      "likes": ["JavaScript", "Gaming", "Foxes"]
  }
];




function lookUpProfile(name, prop){
  for (var i = 0; i < contacts.length; i++) {
      if (contacts[i]["firstName"] == name) {
        if(contacts[i].hasOwnProperty(prop)) {
          return contacts[i][prop];
        } else {
            return "No such property";
        }
      }
  }
  return "No such contact";
}

lookUpProfile("Kristian", "lastName");