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

console.log(lookUpProfile('Kristian', 'likes'));
console.log(lookUpProfile('Sherlock', 'likes'));