TriflingUnluckyDegu created by anonymous - https://repl.it/repls/TriflingUnluckyDegu

TriflingUnluckyDegu.js

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"]
    }
];


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

lookUpProfile('Harry', "leos");