main.js
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//Setup
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(firstName, prop){

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

// Change these values to test your function
lookUpProfile("Sherlock", "likes");
Native Browser JavaScript