freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/profile-lookup.md

id, title, challengeType, videoUrl, forumTopicId, dashedName

id	title	challengeType	videoUrl	forumTopicId	dashedName
5688e62ea601b2482ff8422b	资料查找	1	https://scrimba.com/c/cDqW2Cg	18259	profile-lookup

--description--

我们有一个对象数组，里面存储着通讯录。

lookUpProfile 函数已经写好了参数，需要 name 和属性 (prop) 参数。

函数将会检查通讯录中是否存在一个 firstName 与传入的 name 相同的联系人。 如果存在，那么还需要检查对应的联系人中是否存在 prop 属性。

如果它们都存在，函数返回 prop 属性对应的值。

如果 name 不对应于任何联系人，然后返回字符串 No such contact。

如果 prop 属性在匹配 name 的联系人里不存在，返回 No such property。

--hints--

lookUpProfile("Kristian", "lastName") 应该返回字符串 Vos

assert(lookUpProfile('Kristian', 'lastName') === 'Vos');

lookUpProfile("Sherlock", "likes") 应该返回 ["Intriguing Cases", "Violin"]

assert.deepEqual(lookUpProfile('Sherlock', 'likes'), [
  'Intriguing Cases',
  'Violin'
]);

lookUpProfile("Harry", "likes") 应该返回一个数组

assert(typeof lookUpProfile('Harry', 'likes') === 'object');

lookUpProfile("Bob", "number") 应该返回字符串 No such contact

assert(lookUpProfile('Bob', 'number') === 'No such contact');

lookUpProfile("Bob", "potato") 应该返回字符串 No such contact

assert(lookUpProfile('Bob', 'potato') === 'No such contact');

lookUpProfile("Akira", "address") 应该返回字符串 No such property

assert(lookUpProfile('Akira', 'address') === 'No such property');

--seed--

--seed-contents--

// 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(name, prop) {
  // Only change code below this line

  // Only change code above this line
}

lookUpProfile("Akira", "likes");

--solutions--

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"]
    },
];


//Write your function in between these comments
function lookUpProfile(name, prop){
    for(var i in contacts){
      if(contacts[i].firstName === name) {
        return contacts[i][prop] || "No such property";
      }
    }
   return "No such contact";
}
//Write your function in between these comments

lookUpProfile("Akira", "likes");