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---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 20 - 函式與陣列物件整合運用
綜合前幾天函式觀念以及陣列物件相關操作，回答下方問題。
問題
---
依照註解敘述，完成下方程式碼（只需要補上 `...` 的部分，其餘不要更動）
```javascript=
let courses = [
{
title: 'Javascript',
members: 400,
id: 1,
isStarted: true,
isSoldout: true,
tasks: ['主線任務', '每日任務']
}
];
let newCourse = {
title: 'Vue3',
members: 300,
id: 2,
isStarted: false,
isSoldout: true,
tasks: ['主線任務', '每日任務']
};
// 1. 請將 courses 陣列中 id 為 1 的物件，tasks 陣列新增一筆資料為 '每日刷題'。
// 2. 請完成下方函式，將物件做為參數，判斷當課程中的 isSoldout 屬性為 true 時，
// 就將此物件新增到 courses 陣列中，並回傳 courses 陣列的長度
// （只需要補上 ... 的部分，其餘不要更動）
function addCourse(courseObj) {
if(...) {
courses....;
return ...;
console.log('新增成功');
} else {
console.log('無法新增');
return ...;
}
return;
}
let coursesLength = addCourse(newCourse);
// 3. 完成上方程式碼後，選出正確敘述
// 選項：
// (1) 最後程式碼會印出 '新增成功'，而變數 coursesLength 的值會變為 2
// (2) 最後程式碼不會印出任何字串
// (3) 如果 newCourse 的 isSoldout 屬性值為 false 時，執行 addCourse(newCourse) 將不會印出任何字串，也不會回傳 courses 陣列的長度
```
## 回報流程
將答案寫在 CodePen 並複製 CodePen 連結貼至底下回報就算完成了喔!
解答位置請參考下圖（需打開程式碼的部分觀看）
<!-- 解答：
```javascript=
let courses = [
{
title: 'Javascript',
members: 400,
id: 1,
isStarted: true,
isSoldout: true,
tasks: ['主線任務', '每日任務']
}
];
let newCourse = {
title: 'Vue3',
members: 300,
id: 2,
isStarted: false,
isSoldout: true,
tasks: ['主線任務', '每日任務']
};
// 1.
courses[0].tasks.push('每日刷題');
// 2.
function addCourse(courseObj) {
if(courseObj.isSoldout) {
courses.push(courseObj);
return courses.length;
console.log('新增成功');
} else {
console.log('無法新增');
return courses.length;
}
return;
}
let coursesLength = addCourse(newCourse);
// 3. 完成上方程式碼後，選出正確敘述
// 答案：(2)
```
-->
回報區
---
| Discord | CodePen / 答案 |
|:----------------:|:----------------------------------------------------------------------------:|
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