经典案例获取数组里的对象是否匹配

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

// 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("Akira", "likes");