FCC 题目 Profile Lookup

//初始化变量
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 lookUp(firstName, prop){
// 请把你的代码写在这条注释以下
  for (var i = 0; i < 4; i++) {
    if (contacts[i].firstName == firstName) {
         if (contacts[i].hasOwnProperty(prop) === true) {
           return contacts[i][prop];
         } else {
           return "No such property";
         }
      } 
  }
  return "No such contact";   //这句应该在for循环之外
// 请把你的代码写在这条注释以上
}
// 你可以修改这一行来测试你的代码
lookUp("Sherlock", "likes");

return "No such contact" 一开始在for循环之内，导致无法遍历整个数组，因为遇到return就会退出函数，因此应该放在for循环之外。