# 🏅 4/29 (四) 每日任務 Day 4
###### tags: `Vue 直播班 - 2021 夏季班`

教學
---
這題需要額外理解的知識點為「[callback 函式](https://developer.mozilla.org/zh-TW/docs/Glossary/Callback_function)」，可以簡單的理解為:「把函式作為參數調用」。
舉例:

function greeting(arr) {
  alert('Hello ' + arr.name);
}
// callback 函式
function processUserInput(callback, arr) {
  callback(arr);
}

let arr = {name: "Jordan"};
// 在 callback 函式中調用 greeting 函式，並把 arr 也一併代入
processUserInput(greeting, arr);

題目 (使用 CodePen 作答)
---
以下 crowdAge 為部分民眾的年紀資料，請修改程式碼、篩選出屬性 age > 18 的陣列元素，並將它們一一加入 filterResult 這個陣列中。**(可以使用 [push()](https://wcc723.github.io/development/2020/10/04/js-array-methods/#Array-prototype-push) 或是 [filter() 函式](https://wcc723.github.io/javascript/2017/06/29/es6-native-array/))**

let crowdAge = [
  {
    name: 'Rick',
    age: 17
  },
  {
    name: 'Jane',
    age: 25
  },
  {
    name: 'Jordan',
    age: 19
  },
  {
    name: 'Jack',
    age: 7
  },
  {
    name: 'Reol',
    age: 27
  }
]

// callback 函式
function ageFilterCB(cb, arr) {
  return cb(arr);
}

function ageFilter(arr) {
  /* 只能在此插入程式碼 */
}

let filterResult = [];
filterResult = ageFilterCB(ageFilter, crowdAge);
console.log(filterResult); /* 為陣列，內容包含屬性 age > 18 的 crowdAge 元素 */

回報流程
---
請同學依照下圖教學觀看解答、回報答案:


回報格式如下圖，請在「回報區」使用註解回報答案 (為了統計人數，請同學依序加上「報數」)


<!-- 解法一
function ageFilter(arr) {
let target = arr.filter(item => item.age > 18);
return target;
}
-->

<!-- 解法二
function ageFilter(arr) {
let target = [];
arr.forEach(item => {
if(item.age > 18) {
target.push(item);
}
})
return target;
}
-->

回報區
---
<!--1:alpha
codepen:https://codepen.io/alphatero/pen/abprNqe
-->

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codepen: https://codepen.io/hsuan333/pen/zYNQqWV
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codepen: https://codepen.io/Araytsai/pen/MWJdeKN?editors=0001
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codepen: https://codepen.io/eepson123tw/pen/jOyorMR?editors=1112
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codepen: https://codepen.io/Yiren_Liou/pen/BapeKEr?editors=0011
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codepen: https://codepen.io/kevin-chang-the-sasster/pen/vYgwKZp
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codepen: https://codepen.io/tim-chou/pen/XWpwKgX?editors=1012
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Codepen: https://codepen.io/ChiangJ/pen/dyNEpEB?editors=1011
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Codepen: https://codepen.io/shoppingq/pen/qBRGqjW-->

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有些問題留在註解裡面，再麻煩助教幫我解答，謝謝。
Codepen: https://codepen.io/rtorihnk/pen/JjEqbJg?editors=0011-->

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Codepen:
https://codepen.io/manpower0708/pen/mdRYOqO?editors=0011 -->

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Codepen: https://codepen.io/ericLoveDesign/pen/zYNQNmN?editors=1111
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codepen: https://codepen.io/alertislow/pen/dyNEvNg?editors=0011
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CodePen:https://codepen.io/wave99487chu/pen/MWJdmaG
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codepen: https://codepen.io/JIAN-RONG/pen/wvgbevX?editors=0012
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CodePen: https://codepen.io/izumi-dev/pen/bGgyRZP
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CodePen: https://codepen.io/Sentiments/pen/rNjgGGo?editors=1111
-->

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CodePen: https://codepen.io/dkcyhyre/pen/BapedRa
-->

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CodePen: https://codepen.io/cym199922/pen/jOyoYow?editors=0011
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CodePen: https://codepen.io/pohxiqqo/pen/RwKmQxR?editors=0001
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CodePen: https://codepen.io/LinaChen/pen/bGgyLLY
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CodePen: https://codepen.io/JessieMosbi/pen/bGgyvyP?editors=1111
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CodePen: https://codepen.io/lumedkle/pen/ExZzLoQ?editors=1111
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CodePen: https://codepen.io/yide1986/pen/eYgarLe?editors=0012
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CodePen: https://codepen.io/pengpon77/pen/MWJdXLZ?editors=0012
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CodePen: https://codepen.io/wei-the-lessful/pen/NWdVmdP?editors=0011
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CodePen: https://codepen.io/rockayumitw/pen/rNjgEWB?editors=0011
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codepen: https://codepen.io/JungHanWu/pen/JjEqgPy?editors=0012
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Codepen:https://codepen.io/fred8196/pen/ExZzqeE?editors=0010
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Codepen:https://codepen.io/fttp0165/pen/oNBrNwB?editors=1112
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Codepen:https://codepen.io/Jemma9/pen/eYgawPp?editors=0010
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Codepen： https://codepen.io/Rita-Rossweisse/pen/jOyopjO?editors=0011
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Codepen:https://codepen.io/jason5125122/pen/KKajQqX
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Codepen:https://codepen.io/echocarriet/pen/JjEQLrX
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Codepen:https://codepen.io/amberTing/pen/poRXxPW?editors=0011
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Codepen:https://codepen.io/li-shang/pen/mdRNmdY
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Codepen:https://codepen.io/heavenbird_0221/pen/GRrVmoV?editors=1111
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Codepen:https://codepen.io/hua0124/pen/KKaOvPL
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Codepen:https://codepen.io/jacky298/pen/wvgVqQV
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Codepen:https://codepen.io/jordan-ttc-design/pen/MWJNErr?editors=1012
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Codepen:https://codepen.io/yxzzktmb/pen/VwPoyoE
-->

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Codepen:
https://codepen.io/pen/?editors=1112
-->

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Codepen:
https://codepen.io/argent1027/pen/GRrVGXp?editors=0011
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Codepen:
https://codepen.io/tsuifei/pen/xxgveaL?editors=1111
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CodePen: https://codepen.io/uwhhiaxx/pen/xxgvPMV?editors=0012
-->

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codepen:https://codepen.io/otherway1123/pen/bGqbgyK?editors=1011
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codepen:https://codepen.io/asd40441/pen/xxqKqgE?editors=0011
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codepen: https://codepen.io/LuckyTiger/pen/PopYBgJ
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codepen: https://codepen.io/vicky-chang/pen/LYWPJbb?editors=1012
-->

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codepen: https://codepen.io/somebody1997/pen/OJpJQmG?editors=1011
-->
<!-- 報數 67: Josh Fang
function ageFilter(arr) {
let result = arr.filter(item => item.age > 18);

return result;
}
codepen:
https://codepen.io/joshfang-the-encoder/pen/abJbqdW?editors=1113
-->
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報數 68 : Chiayu
codepen: https://codepen.io/alphatero/pen/abprNqe?editors=0011
-->

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codepen: https://codepen.io/Channing/pen/VwpYPNY
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codepen: https://codepen.io/twoz/pen/oNZgqwm?editors=0012
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codepen: https://codepen.io/Tofutseng/pen/YzZPRKR?editors=0001
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codepen: https://codepen.io/jayredk/pen/jOBPEQe?editors=1012
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CodePen: https://codepen.io/fuchang830714/pen/yLgmGEY
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CodePen: https://codepen.io/taonong/pen/XWMmMbq
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codePen: https://codepen.io/MINN3/pen/JjWGmjQ
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codepen: https://codepen.io/ccyy915/pen/eYvZYJm
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codepen: https://codepen.io/alanwu0828/pen/poezQeL?editors=0012
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codePen:
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codepen:
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codepen:
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codepen:
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codepen:
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codepen:
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codepen:

https://codepen.io/chiakilalala/pen/qBxxoOV?editors=1011
-->