145 lines
3.1 KiB
Markdown
145 lines
3.1 KiB
Markdown
---
|
|
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";
|
|
}
|
|
```
|