---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 18 - 函式觀念三
依照下方程式碼練習，並回答問題。
### 函式參數觀念
[課程影音連結](https://courses.hexschool.com/courses/202011131/lectures/42391125)（函式參數介紹、參數寫法）
1. 函式可以帶入自定義的參數（在此為 num1, num2），並在呼叫函式的時候傳入。
```javascript=
function callNum(num1, num2){
let total = num1 + num2;
console.log(total);
}
// num1 等於 1, num2 等於 2
callNum(1, 2);
// num1 等於 2, num2 等於 4
callNum(2, 4);
```
2. 參數只存活在大括號。
```javascript=
function callNum(num){
// 在此可以成功呼叫 num
console.log(num);
}
callNum(1);
// 函數外部不可以呼叫 num，這行會報錯
// Uncaught ReferenceError: num is not defined
console.log(num);
```
問題
---
1. 觀看以下程式碼，最後會印出什麼，以及變數 `sum` 最後的值
```javascript=
let sum = 1;
function calcNum(x) {
sum += x;
console.log(x);
}
calcNum(3);
```
2. 下方程式碼宣告了一個陣列（陣列內是費波那契數列），請完成下方程式碼（補上 `...` 的部分），讓 `calcNextNum()` 函式可以正常執行，並讓陣列中最後兩個數字相加後 push 到陣列中，最後 `fibonacciArr` 陣列值為 `[1, 1, 2, 3, 5, 8]`
```javascript=
let fibonacciArr = [1, 1, 2, 3, 5];
let fibonacciArrLength = fibonacciArr.length;
function calcNextNum(...) {
...
}
calcNextNum(fibonacciArr[fibonacciArrLength-1], fibonacciArr[fibonacciArrLength-2]);
console.log(fibonacciArr);
```
## 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：
1. 3,
sum: 4
2.
```javascript=
let fibonacciArr = [1, 1, 2, 3, 5];
let fibonacciArrLength = fibonacciArr.length;
function calcNextNum(last, penultimate) { // 參數命名可以隨意自訂
fibonacciArr.push(last+penultimate);
}
calcNextNum(fibonacciArr[fibonacciArrLength-1], fibonacciArr[fibonacciArrLength-2]);
console.log(fibonacciArr);
```
-->
回報區
---
| Discord | CodePen / 答案 |
|:--------------------:|:--------------------------------------------------------------------------------:|
| 嗶嗶羊#8042 | [Codepen](https://codepen.io/mazizlte-the-typescripter/pen/abKzPaP?editors=0011) |
| masterYan#2480 | [Codepen](https://codepen.io/htzwgoqt-the-looper/pen/xxzxMOG?editors=1111) |
| albee#9121 | [Codepen](https://codepen.io/albee-chang/pen/abKbLeJ) |
| hsiung阿熊#4079 | [Codepen](https://codepen.io/hsiungchi/pen/LYrYqPV) |
| 君Jyun#0147 | [codepen](https://codepen.io/Okaybeok/pen/NWzWoPY?editors=0011) |
| Ayre#0016 | [Codepen](https://codepen.io/yichunlin09/pen/yLELZeG?editors=0010) |
| suihsilan#9485 | [Codepen](https://codepen.io/suihsilan/pen/eYKYxNo?editors=0010) |
| 予予#9627 | [Codepen](https://codepen.io/kiqzcraa/pen/LYrYqNG?editors=0011) |
| CloThEs#7837 | [Codepen](https://codepen.io/CloThEsZ/pen/KKeKJVG) |
| 薯餅#3581 | [Codepen](https://codepen.io/ColdingPoTaTo/pen/rNKNPOg) |
| Ron Liang#7277 | [Codepen](https://codepen.io/ron-go/pen/MWXWLbx) |
| VT#0895 | [Codepen](https://codepen.io/vt197/pen/poKoGNq) |
| YC#2522 | [CodePen](https://codepen.io/YCLu/pen/ZERzXoQ) |
| jimmyFang#9575 | [CodePen](https://codepen.io/pohxiqqo/pen/OJEJdRz?editors=0011) |
| Kimi #9564 | [Codepen](https://codepen.io/kimihu91/pen/ExRxryx) |
| DaisyLi#4231 | [CodePen](https://codepen.io/lidairong-gmail-com/pen/VwdwgeK?editors=0012) |
| Clara#1275 | [Codepen](https://codepen.io/bsupixqu/pen/ZEREweN?editors=1112) |
| yumy#1940 | [Codepen](https://codepen.io/yumy_yamg/pen/vYrYbJZ) |
| 末次#0236 | [Codepen](https://codepen.io/yunjulee/pen/NWzWodB) |
| Wei#2330 | [Codepen](https://codepen.io/ixfjxrbo-the-typescripter/pen/gOKOqGo) |
| AuroraC#6539 | [codepen](https://codepen.io/AuroraC/pen/JjZjxrX?editors=0011) |
| Cliff#4606 | [Codepen](https://codepen.io/Cliff_hex/pen/MWXWLrM) |
| RyanTsai#8906 | [CodePen](https://codepen.io/linlaose/pen/poKoGaB) |
| 無名#6427 | [CodePen](https://codepen.io/Nomoney/pen/poKoGyQ?editors=0011) |
| KatyChiang#1554 | [CodePen](https://codepen.io/Kai0819/pen/gOKOqee?editors=0011) |
| 芮綺#5224 | [Codepen](https://codepen.io/zhan70/pen/ZEREwag?editors=1011) |
| Benson#6763 | [Codepen](https://codepen.io/kumashow/pen/XWYWOYb) |
| Winnie#1306 | [Codepen](https://codepen.io/WinnieWuWinnie/pen/eYKYxjm?editors=0012) |
| Tami#6742 | [CodePen](https://codepen.io/wqsdqbjn-the-vuer/pen/QWxWYxY) |
| 法希娜#3206 | [CodePen](https://codepen.io/yiiserpf-the-encoder/pen/BaVaMPO?editors=0011) |
| Data#9297 | [CodePen](https://codepen.io/kirakira72/pen/jOKOdKJ) |
| YI#0863 | [CodePen](https://codepen.io/YI0305/pen/dyKyarV?editors=0012) |
| LHchien33#6232 | [CodePen](https://codepen.io/lin_chien/pen/dyKyawz?editors=0010) |
| kenki100#0068 | [codepen](https://codepen.io/ken100/pen/GRGRzrM) |
| 威爾#1694 | [CodePen](https://codepen.io/WILL_Wu/pen/oNyNVvG) |
| mandylai#4055 | [CodePen](https://codepen.io/mandy-lai-2/pen/OJEJdKa?editors=0012) |
| JustinLiu#9699 | [CodePen](https://codepen.io/justin0227/pen/OJEJqVr?editors=0011) |
| Jenny真#7532 | [CodePen](https://codepen.io/wei-chen-wu/pen/bGKGzXZ?editors=0010) |
| amy芳#1385 | [CodePen](https://codepen.io/amy-chieng/pen/RwJwdRY) |
| yawun#0042 | [CodePen](https://codepen.io/monicalin/pen/MWXWxey) |
| m_m#5493 | [Codepen](https://codepen.io/minnn7716/pen/eYKYXBd) |
| 魚子醬#5220 | [CodePen](https://codepen.io/haihsuan/pen/rNKNRwy) |
| 勁辣雞腿寶#5817 | [Codepen](https://codepen.io/orz311013/pen/oNyNVoy?editors=1011) |
| 小白#2406 | [CodePen](https://codepen.io/gracewhite/pen/gOKOExE) |
| 肉桂卷#0625 | [CodePen](https://codepen.io/ginnlee/pen/mdKdomQ?editors=0012) |
| JackC#0411 | [CodePen](https://codepen.io/key0329/pen/yLELwXO) |
| 出事了阿伯#9923 | [CodePen](https://codepen.io/BradpittLai/pen/vYrYPXa?editors=1010) |
| 圈圈#4060 | [Codepen](https://codepen.io/wjejfcan-the-bold/pen/RwJwdmm) |
| kuku#3118 | [Codepen](https://codepen.io/mengting-ku/pen/mdKdgry?editors=1011) |
| RJRS#9430 | [CodePen](https://codepen.io/RJRS/pen/XWYWQRB) |
| Loran#1105 | [CodePen](https://codepen.io/loranlin/pen/mdKdgxV?editors=1011) |
| azami#5986 | [Codepen](https://codepen.io/azami/pen/zYaYXay) |
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| Arista#5802 | [CodePen](https://codepen.io/arista-hsieh/pen/xxzxNRG) |
| Cookie SSS#6991 | [CodePen](https://codepen.io/sqhjikpa-the-selector/pen/xxzxNjO?editors=1011) |
| k.sin#3115 | [Codepen](https://codepen.io/sin588/pen/ExRxzzg?editors=0011) |
| Rena#6249 | [Codepen](https://codepen.io/aureate0116/pen/Yzvzopv?editors=0011) |
| Chung#5951 | [Codepen](https://codepen.io/yuju16/pen/jOKOjQr?editors=0010) |
| Potatolee#7749 | [Codepen](https://codepen.io/potatoleee/pen/YzvzorO) |
| Yishan#4902 | [Codepen](https://codepen.io/gdjrehhw-the-animator/pen/jOKOgNy?editors=0010) |
| Hilda#7085 | [Codepen](https://codepen.io/vwquikad-the-vuer/pen/mdKdNxV) |
| William Lai#0196 | [Codepen](https://codepen.io/lai-weihan/pen/OJEJKvb) |
| Yiru#0236 | [Codepen](https://codepen.io/yiru94/pen/QWxWeRm?editors=0011) |
| hannahTW#2224 | [Codepen](https://codepen.io/hangineer/pen/PoaoMEz?editors=0011) |
| shinyhung#3825 | [Codepen](https://codepen.io/sean_1215/pen/dyKPbMX?editors=1111) |
| 心幻羽#0056 | [Codepen](https://codepen.io/linglingsyu/pen/PoawYJQ?editors=1111) |
| 我是泇吟#5189 | [CodePen](https://codepen.io/kljuqbxs/pen/GRGgRRB) |
| Judy Wei#6103 | [CodePen](https://codepen.io/Judy0718/pen/ExRaxNm) |
| charlottelee849#0366 | [CodePen](https://codepen.io/charlotte-lee/pen/ExRaxZm?editors=1111) |
| Amberhh#2465 | [Codepen](https://codepen.io/Amberhh/pen/XWYWOKv) |
| 雷雷#7844 | [Codepen](https://codepen.io/lei-yi-jie/pen/poKvvgw?editors=0010) |
| Sentiments#4883 | [codepen](https://codepen.io/Sentiments/pen/GRGggxZ?editors=0011) |
| SASIMI#5099 | [Codepen](https://codepen.io/sashimi1327/pen/qBYMXLa) |
| 萱仔#0781 | [Codepen](https://codepen.io/ting-hsuan/pen/yLEyymx?editors=0010) |
| RayChen#6088 | [Codepen](https://codepen.io/raychen1996/pen/gOKbpYm) |
| yoyo#1003 | [Codepen](https://codepen.io/crpbugqy-the-typescripter/pen/VwdYYJe) |
| WEI_RIO#9342 | [Codepen](https://codepen.io/wei_wu/pen/mdKyJyR?editors=0011) |
| jackson204#6363 | [Codepen](https://codepen.io/jackson204/pen/bGKNdWM) |
| 威0#6919 | [Codepen](https://codepen.io/n0918679182/pen/RwJNPjZ?editors=0012) |
| 黑松胖#4836 | [Codepen](https://codepen.io/yi-chien-hsieh/pen/gOKbpev?editors=0012) |
| mou#2215 | [Codepen](https://codepen.io/shihchiehlan/pen/GRGgpZX?editors=0010) |
| 竹輪#3335 | [Codepen](https://codepen.io/chikuwa0120/pen/KKewdMK) |
| Silvialu#4521 | [Codepen](https://codepen.io/Silvia091640/pen/abKzdwQ) |
| CofCat#9226 | [Codepen](https://codepen.io/cofcat456/pen/VwdYawe?editors=1011) |
| 大衛#4869 | [Codepen](https://codepen.io/exnsrpjc/pen/NWzPNOE?editors=0011) |
| 狸貓#5863 | [Codepen](https://codepen.io/tanuki320/pen/ExRaxxN?editors=0010) |
| 蓁心#6229 | [Codepen](https://codepen.io/tlorfrnl-the-typescripter/pen/jOKErrN?editors=0011) |
| Hironaka#7367 | [Codepen](https://codepen.io/Hironaka0815/pen/xxzbEGJ) |
| Jamie Wu#9345 | [Codepen](https://codepen.io/Wu220103/pen/bGKNwrB) |
| Ruby Chen#7452 | [Codepen](https://codepen.io/ruby92429/pen/zYaxKoa?editors=0011) |
| Mylène#2481 | [Codepen](https://codepen.io/hamajibashi/pen/NWzPRvd) |
| hungya#0773 | [Codepen](https://codepen.io/hungya777/pen/yLEyazp?editors=0011) |
| 黃士桓#7654 | [codePen](https://codepen.io/shr-huan-huang/pen/MWXYJWY) |
| 楓之聲#6945 | [Codepen](https://codepen.io/sshane258/pen/WNyboBm) |
| yen#5757 | [Codepen](https://codepen.io/TZU-HUANG-YEN/pen/oNdPgqY?editors=0011) |
| yoshidc#0455 | [Codepen](https://codepen.io/yoshiyyc/pen/qBKEpQG) |
| 母湯#7211 | [Codepen](https://codepen.io/tommyshih77/pen/poKvpBL?editors=0011) |
| 黑白兔#0684 | [Codepen](https://codepen.io/johnny329/pen/ZERYrWV) |
| 哈囉哈#5196 | [CodePen](https://codepen.io/bill0841205/pen/ExRaENZ?editors=1011) |
| beta lin#1445 | [CodePen](https://codepen.io/linbeta/pen/XWYJEzp) |
| Yuna Huang#2692 | [CodePen](https://codepen.io/Yuna1002/pen/vYrERVQ?editors=0010) |
| 艾芮絲#6060 | [CodePen](https://codepen.io/wangyingju/pen/wvXBjoM) |
| Paul#7426 | [CodePen](https://codepen.io/paul-1997/pen/mdKyLqy?editors=0011) |
| homer#1525 | [CodePen](https://codepen.io/Buckhorn/pen/LYrEdBd) |
| Lucie#3831 | [Codepen](https://codepen.io/bisespei/pen/YzvPYeK) |
| 柔柔#1716 | [Codepen](https://codepen.io/rouchen/pen/ZERYjqB?editors=1011) |
| banazita#5143 | [CodePen](https://codepen.io/banazita/pen/gOKOVxP?editors=1111) |
| Ohno#1144 | [Codepen](https://codepen.io/mmaa7850/pen/RwJNeoo?editors=0011) |
| jin.huang#4666 | [Codepen](https://codepen.io/haha1196/pen/gOKbEEy?editors=1010) |
| Mia小福#4473 | [Codepen](https://codepen.io/a0950271/pen/NWzPVmO) |
| J_u_d_y#5993 | [Codepen](https://codepen.io/J_u_d_y/pen/LYrEKvm?editors=1111) |
| Dora#8223 | [Codepen](https://codepen.io/mwebwvuq-the-flexboxer/pen/YzvXzra) |
| 健育#5748 | [Codepen](https://codepen.io/c1317156/pen/NWzqbWg?editors=0012) |
| Greta#0837 | [CodePen](https://codepen.io/gretali/pen/bGKdBwo) |
| Ryan Chiang#6649 | [Codepen](https://codepen.io/pen/?editors=0012) |
| 教練#6451 | [Codepen](https://codepen.io/monkeybear721/pen/gOKOEwZ) |
| IreneY#0086 | [codepen](https://codepen.io/HalfPlannedJourney/pen/GRGJrGY) |
| 阿風#6890 | [codepen](https://codepen.io/Afonguwu/pen/xxzGdZN?editors=0110) |
| FiReBrO#0557 | [codepen](https://codepen.io/firebro42/pen/WNyvOrL?editors=0011) |
| yaru#6308 | [codepen](https://codepen.io/lszaietc/pen/LYrEKWj) |
| 安o#2448 | [codePen](https://codepen.io/JzhenAn/pen/LYrVqaG?editors=1111) |
|kevin #6131 | [codePen](https://codepen.io/xlqjezvc-the-encoder/pen/MWXwxYd?editors=1011) |
|sophiee#7015|[Codepen](https://codepen.io/sophiee2727/pen/dyKoaxO?editors=1011)|
|王懷英#7271|[Codepen](https://codepen.io/huaiying/pen/PoaqLrV)|
|Eileen#6454|[Codepen](https://codepen.io/Eileen-io/pen/xxzGeMy)|
| 富#0389 | [codePen](https://codepen.io/spring40747/pen/yLENWJK?editors=1111) |
| Awei#0720 | [codePen](https://codepen.io/Aweishi/pen/LYrpZyx?editors=0010) |
|YU#0618|[Codepen](https://codepen.io/yoken_/pen/oNyjLVo)|
| Powei#8484|[codepen](https://codepen.io/harrison-wei-lai/pen/QWxjKQN?editors=1111)|
|ling chang#1024|[Codepen](https://codepen.io/ling-chang/pen/xxzwRde)|
|cotton#7163|[Codepen](https://codepen.io/cottonT/pen/OJEymKO?editors=0010)|
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|Ringo#7583|[Codepen](https://codepen.io/ringolai1988/pen/jOKbLQV?editors=1010)|
|Jhen#4563|[Codepen](https://codepen.io/su-jhen/pen/WNyQEVo)|
|Shuo#1596|[Codepen](https://codepen.io/chiangchungshuo/pen/jOKbaNv)|
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|Peng#9811|[Codepen](https://codepen.io/peng-027/pen/mdKeLGY)|
|shio#1414|[Codepen](https://codepen.io/shioyen/pen/dyKYaBG?editors=1111)|
|bingsu#2362|[Codepen](https://codepen.io/pmyfr/pen/wvXKbQe?editors=0010)|
|How#5806|[Codepen](https://codepen.io/howtobefine/pen/PoaZdrM)|
|mei#8421|[Codepen](https://codepen.io/Shila-Chen/pen/WNyrBGx?editors=0010)|
|yuling#1634|[codepen](https://codepen.io/igzdflpu/pen/abKNpqo)|
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|三隻小貓#1905|[CodePen](https://codepen.io/bagelover/pen/GRGZXoy)|
|Azi Hsieh#2861|[CodePen](https://codepen.io/AziHsieh/pen/WNywaRr)|
|Nini Chen#5790|[CodePen](https://codepen.io/ninistyle/pen/oNyLzEw?editors=0012)|
|Cynthia1111#1822|[CodePen](https://codepen.io/Cynthia1111/pen/gOKMxzK)|
|Tuhacrt#0008|[codepen](https://codepen.io/Tuhacrt/pen/ExRyzjZ)|
|Cream#3449|[codepen](https://codepen.io/frxdwbbi-the-sasster/pen/MWXjJGV?editors=0011)|
|L0F0#8733|[codepen](https://codepen.io/l0f0/pen/RwJojRd?editors=0011)|
|Lou#0085|[codepen](https://codepen.io/Lusie_H/pen/MWXbLOY?editors=0011)|
|meimei#9524|[codepen](https://codepen.io/isnrudav/pen/jOKLjNZ?editors=1111)|
|yuchenye#6119|[codepen](https://codepen.io/yuchen/pen/yLEzYoQ)|
|H.L.C#2152|[CodePen](https://codepen.io/hsin-liang/pen/bGKogjM)|
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