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

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

# --description--

我們有一個對象數組，裏面存儲着通訊錄。

`lookUpProfile` 函數已經寫好了參數，需要 `name` 和屬性 (`prop`) 參數。

函數將會檢查通訊錄中是否存在一個 `firstName` 與傳入的 `name` 相同的聯繫人。 如果存在，那麼還需要檢查對應的聯繫人中是否存在 `prop` 屬性。

如果它們都存在，函數返回 prop 屬性對應的值。

如果 `name` 不對應於任何聯繫人，然後返回字符串 `No such contact`。

如果 `prop` 屬性在匹配 `name` 的聯繫人裏不存在，返回 `No such property`。

# --hints--

`lookUpProfile("Kristian", "lastName")` 應該返回字符串 `Vos`

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

`lookUpProfile("Sherlock", "likes")` 應該返回 `["Intriguing Cases", "Violin"]`

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

`lookUpProfile("Harry", "likes")` 應該返回一個數組

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

`lookUpProfile("Bob", "number")` 應該返回字符串 `No such contact`

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

`lookUpProfile("Bob", "potato")` 應該返回字符串 `No such contact`

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

`lookUpProfile("Akira", "address")` 應該返回字符串 `No such property`

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

# --seed--

## --seed-contents--

```js
// Setup
const 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
const 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) {
  for (let i in contacts) {
    if (contacts[i].firstName === name) {
      return contacts[i][prop] || "No such property";
    }
  }
  return "No such contact";
}
```