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

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

# --description--

我们有一个对象数组，里面存储着通讯录。

函数`lookUp`有两个预定义参数：`firstName`值和`prop`属性 。

函数将会检查通讯录中是否存在一个与传入的`firstName`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`firstName`值不存在，返回`"No such contact"`。

如果`prop`属性不存在，返回`"No such property"`。

# --hints--

`"Kristian", "lastName"`应该返回 `"Vos"`。

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

`"Sherlock", "likes"`应该返回 `["Intriguing Cases", "Violin"]`。

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

`"Harry","likes"`应该返回 an array。

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

`"Bob", "number"`应该返回 "No such contact"。

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

`"Bob", "potato"`应该返回 "No such contact"。

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

`"Akira", "address"`应该返回 "No such property"。

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

# --seed--

## --seed-contents--

```js
// 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--

```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"]
    },
];


//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");
```