---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 04 - 型別陷阱題

### 題目

以下題目請合併為一份 CodePen 繳交，並透過「註解」進行回答。

問題
---
以下變數 a, b, c, d 它們的值、型別各自為何？
( 請先想想看，不要用 console.log 檢查 ᕙ( ˙-˙ )ᕗ )

let a = true + true ;
let b = false + 123 ;
let c = null + 123 ;
let d = null + '123';

範例回答格式：

// a = 值, 型別
// b = 值, 型別

## 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：

a = 2, number
b = 123, number
c = 123, number
d = 'null123', string

補充文章：https://ithelp.ithome.com.tw/articles/10191180
-->

回報區
---

| Discord | CodePen / 答案 |
|:---------------------:|:--------------------------------------------------------------------------------:|
| 嗶嗶羊#8042 | [CodePen](https://codepen.io/mazizlte-the-typescripter/pen/ExLeyWp?editors=0010) |
| 瑋慶#2480 | [CodePen](https://codepen.io/htzwgoqt-the-looper/pen/xxjaKKg?editors=1111) |
| Tami#6742 | [CodePen](https://codepen.io/wqsdqbjn-the-vuer/pen/jOxpJXZ?editors=0010) |
| YC#2522 | [CodePen](https://codepen.io/YCLu/pen/BaxPKyE) |
| 君Jyun#0147 | [codepen](https://codepen.io/Okaybeok/pen/xxjJBQN?editors=0010) |
| Ayre#0016 | [Codepen](https://codepen.io/yichunlin09/pen/NWMBJow?editors=0010) |
| 威0#6919 | [Codepen](https://codepen.io/n0918679182/pen/qBYyvvW?editors=0011) |
| hsiung阿熊#4079 | [Codepen](https://codepen.io/hsiungchi/pen/poVZYqV) |
| kuku#3118 | [Codepen](https://codepen.io/mengting-ku/pen/qBYyvwW?editors=0010) |
| AuroraC#6539 | [codepen](https://codepen.io/AuroraC/pen/poVZYBK?editors=1010) |
| CloThEs# | [codepen](https://codepen.io/CloThEsZ/pen/gOzjENm) |
| shinyhung#3825 | [codepen](https://codepen.io/pen/?editors=1111) |
| jackson204#6363 | [codepen](https://codepen.io/jackson204/pen/dyejrxY) |
| albee#9121 | [Codepen](https://codepen.io/albee-chang/pen/QWrBoem?editors=1010) |
| 薯餅#3581 | [Codepen](https://codepen.io/ColdingPoTaTo/pen/NWMBJZX) |
| 芮綺#5224 | [Codepen](https://codepen.io/zhan70/pen/abGjxoe?editors=0010) |
| Judy☻ #7874 | [CodePen](https://codepen.io/hsiaohan/pen/BaxPEBw?editors=1011) |
| 出事了阿伯#9923 | [Codepen](https://codepen.io/BradpittLai/pen/YzLjgoq?editors=1010) |
| 肉桂卷#0625 | [Codepen](https://codepen.io/ginnlee/pen/ExLpMqB?editors=0011) |
| jimmyFang#9575 | [Codepen](https://codepen.io/pohxiqqo/pen/KKRBYdx?editors=0010) |
| 教練#6451 | [Codepen](https://codepen.io/monkeybear721/pen/dyejLXX) |
| Clara#1275 | [Codepen](https://codepen.io/bsupixqu/pen/RwyBOGp?editors=0011) |
| 軟綿綿 (๑•ᴗ•๑) ♡#3627 | [CodePen](https://codepen.io/Connie-Chien/pen/NWMBmRM?editors=0011) |
| CofCat#9226 | [CodePen](https://codepen.io/cofcat456/pen/YzLjMGp?editors=1011) |
| m_m#5493 | [Codepen](https://codepen.io/minnn7716/pen/RwyBOKV) |
| VT#0895 | [Codepen](https://codepen.io/vt197/pen/rNvrbyX) |
| yoshidc#0455 | [CodePen](https://codepen.io/yoshiyyc/pen/MWGBRvd) |
| hannahTW#2224 | [Codepen](https://codepen.io/hangineer/pen/bGMjJRK?editors=0011) |
| Iris_#8462 | [Codepen](https://codepen.io/pen/?editors=1111) |
| 哈囉哈#5196 | [Codepen](https://codepen.io/bill0841205/pen/ExLpJoj) |
| amy芳#1385 | [Codepen](https://codepen.io/amy-chieng/pen/RwyBOML) |
| Gill#9280 | [Codepen](https://codepen.io/Gill-Chin/pen/MWGBVKr) |
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| Peng#9811 | [Codepen](https://codepen.io/peng-027/pen/eYrjoQm?editors=1011) |
| 阿風#6890 | [Codepen](https://codepen.io/Afonguwu/pen/QWrBPPP) |
| Chung#5951 | [Codepen](https://codepen.io/yuju16/pen/RwyBOmM) |
| Benson#6763 | [Codepen](https://codepen.io/kumashow/pen/dyejmGE) |
| 法希娜#3206 | [Codepen](https://codepen.io/yiiserpf-the-encoder/pen/poVZBXz) |
| Yiru#0236 | [Codepen](https://codepen.io/yiru94/pen/abGjxeB?editors=0010) |
| cotton#7163 | [Codepen](https://codepen.io/cottonT/pen/ExLpJzg?editors=1011) |
| hungya#0773 | [Codepen](https://codepen.io/hungya777/pen/MWGBRXN?editors=0010) |
| KatyChiang#1554 | [Codepen](https://codepen.io/Kai0819/pen/yLjqWyy?editors=1011) |
| 威爾#1694 | [CodePen](https://codepen.io/WILL_Wu/pen/zYjLQxK) |
| Lucie#3831 | [CodePen](https://codepen.io/bisespei/pen/qBYywxa) |
| JackC#0411 | [CodePen](https://codepen.io/key0329/pen/bGMjydJ) |
| 無名#6427 | [CodePen](https://codepen.io/Nomoney/pen/BaxPeNM) |
| Cliff#4606 | [Codepen](https://codepen.io/Cliff_hex/pen/GRdBagB) |
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| Hilda#7085 | [Codepen](https://codepen.io/vwquikad-the-vuer/pen/XWqBwKN) |
| JustinLiu#9699 | [CodePen](https://codepen.io/justin0227/pen/oNdMRYE?editors=0011) |
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| azami#5986 | [Codepen](https://codepen.io/azami/pen/QWrBRgw) |
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| jamesccc#6244 | [Codepen](https://codepen.io/nimwnynv-the-sasster/pen/BaxPemg?editors=1111) |
| yawun#0042 | [CodePen](https://codepen.io/monicalin/pen/PoeBvBr) |
| Winnie#1306 | [Codepen](https://codepen.io/WinnieWuWinnie/pen/MWGBdPp?editors=0010) |
| 泰泰泰泰#0582 | [Codepen](https://codepen.io/tesdzzph-the-bashful/pen/gOzjJEV?editors=1010) |
| suihsilan#9485 | [Codepen](https://codepen.io/suihsilan/pen/poVZmMe?editors=0010) |
| 末次#0236 | [Codepen](https://codepen.io/yunjulee/pen/KKRBjwW) |
| Rice#8043 | [Codepen](https://codepen.io/riecball/pen/yLjqdLX?editors=0011) |
| 楓之聲#6945 | [Codepen](https://codepen.io/sshane258/pen/rNvrEap) |
| ssozr#4680 | [codepeb](https://codepen.io/ssozr/pen/PoeBrPq?editors=0011) |
| Rr#2215 | [Codepen](https://codepen.io/rufangcheng/pen/RwyBzrX) |
| 柔柔#1716 | [codepeb](https://codepen.io/rouchen/pen/vYjaqLq) |
| Fan#3405 | [codepen](https://codepen.io/Fan123/pen/XWqBLMY) |
| 魚子醬cavier#5220 | [codepan](https://codepen.io/haihsuan/pen/gOzjNWa) |
| KC_8685#9343 | [codepan](https://codepen.io/cathy7411/pen/poVZYvP) |
| banazit#5143 | [Codepen](https://codepen.io/banazita/pen/gOzjNXr?editors=1111) |
| Velma#1693 | [Codepen](https://codepen.io/Ze1225/pen/XWqBLqx?editors=0010) |
| meimei#1693 | [Codepen](https://codepen.io/isnrudav/pen/KKRBjxQ) |
| AkiHico#9239 | [Codepen](https://codepen.io/akihico/pen/GRdBbYq?editors=1010) |
| yumy#1940 | [Codepen](https://codepen.io/yumy_yamg/pen/RwyBzdR) |
| Barret#1119 | [Codepen](https://codepen.io/barret0720/pen/BaxPgeZ?editors=0010) |
| Rena#6249 | [Codepen](https://codepen.io/aureate0116/pen/dyejxMM) |
| yishan#4902 | [Codepen](https://codepen.io/gdjrehhw-the-animator/pen/ExLpqVq?editors=0010) |
| William Lai#0196 | [Codepen](https://codepen.io/lai-weihan/pen/MWGBNoR) |
| 0xWilliam #8796 | [Codepen](https://codepen.io/0xWilliam0322/pen/ZEojgXd) |
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| Yuna Huang#2692 | [CodePen](https://codepen.io/Yuna1002/pen/bGMxbWP?editors=0010) |
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| Amberhh#2465 | [Codepen](https://codepen.io/Amberhh/pen/JjvBzzg) |
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| FiReBrO#0557 | [CodePen](https://codepen.io/firebro42/pen/PoedwbJ?editors=1111) |
| Baozi#2042 | [CodePen](https://codepen.io/lillianyu/pen/MWGqYaZ) |
| yen#5757 | [CodePen](https://codepen.io/TZU-HUANG-YEN/pen/oNdPgqY?editors=1010) |
| 我是泇吟#5189 | [CodePen](https://codepen.io/kljuqbxs/pen/BaxOygq) |
| AmberWang#2504 | [CodePen](https://codepen.io/dmpjhhtt-the-typescripter/pen/MWGqwLp?editors=0010) |
| SASIMI#5099 | [CodePen](https://codepen.io/sashimi1327/pen/KKRxwRE) |
| yiling#4054 | [CodePen](https://codepen.io/lin010/pen/KKRxdyX?editors=0011) |
| beta lin#1445 | [CodePen](https://codepen.io/linbeta/pen/XWqPmEP) |
| SunnyCheng#4113 | [CodePen](https://codepen.io/Sunny0509/pen/LYmJpdo?editors=1111) |
| 朧.#9548 | [CodePen](https://codepen.io/crushing_omega/pen/abGavQM) |
| Data#9297 | [CodePen](https://codepen.io/kirakira72/pen/dyeqGPY) |
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| mandylai#4055 | [codePen](https://codepen.io/mandy-lai-2/pen/abGjxKN?editors=0010) |
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| Kimi#9564 | [codePen](https://codepen.io/kimihu91/pen/wvXvNZR) |
| YU #0618 | [Codepen](https://codepen.io/yoken_/pen/yLjxOjJ) |
| pidder#7315 | [Codepen](https://codepen.io/liaoben/pen/oNdPLgQ) |
| 萱仔#0781 | [Codepen](https://codepen.io/ting-hsuan/pen/eYrLzmG?editors=1010) |
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| mou#2215 | [Codepen](https://codepen.io/shihchiehlan/pen/MWGqyRp?editors=0010) |
| lee#5462 | [Codepen](https://codepen.io/barrylee85/pen/abGaZaX?editors=0010) |
| RJRS#9430 | [Codepen](https://codepen.io/RJRS/pen/XWqPKyy) |
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| Curtis#4780 | [Codepen](https://codepen.io/curtislin/pen/ZEoMpLP?editors=1010) |
| kenki100#0068 | [Codepen](https://codepen.io/ken100/pen/yLjxaMG) |
| kevin#6131 | [Codepen](https://codepen.io/xlqjezvc-the-encoder/pen/ZEoMprd?editors=1011) |
| LHchien33#6232 | [Codepen](https://codepen.io/lin_chien/pen/MWGqjdg?editors=0010) |
| WEI_RIO#9342 | [Codepen](https://codepen.io/wei_wu/pen/XWqPNep?editors=0010) |
| Ryan Chiang#6649 | [Codepen](https://codepen.io/pen/?editors=0010) |
| Jhen#4563 | [Codepen](https://codepen.io/su-jhen/pen/QWrVGZj) |
| hayaka#4579 |[Codepen](https://codepen.io/CocoCat/pen/jOxvBNz?editors=0011)|
| 王懷英#7271 | [Codepen](https://codepen.io/huaiying/pen/poVONyo) |
| juri#5114 | [Codepen](https://codepen.io/jurry126/pen/ZEoMLjR?editors=0010) |
| Shalina123#3090 | [Codepen](https://codepen.io/shalina123/pen/RwyYKYW) |
Po Wei#8484 |[Codepen](https://codepen.io/harrison-wei-lai/pen/JjvaEBV)|
| Mia小福#4473 | [Codepen](https://codepen.io/a0950271/pen/ExLeWWY) |
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