---
tags: 公益程式體驗營 - 2022
---

# 🏅 5/18(三) 每日 JS 刷題任務 - 混合題

### 題目一：星星顯示

// input 輸入
createStar(1)
createStar(3)
createStar(5)
// output 輸出
"*"
"***"
"*****"

### 題目二：反轉陣列

// input 輸入
reverseAry([7,8,9])
reverseAry(["black","white","red"])
reverseAry([{name:"mike"},{name:"John"}])
// output 輸出
[9,8,7]
["red","white","black"]
[{name:"John"},{name:"mike"}]

### 題目三：陣列轉字串

// input 輸入
aryToString([7,8,9])
aryToString(["black","white","red"])
aryToString([true,false,true])
// output 輸出
"9,8,7"
"red,white,black"
"true,false,true"

### 題目四：進階題，不適合新手：雙 for 迴圈

// input 輸入
multiplication(3)
multiplication(5)
// output 輸出 為字串格式
//  multiplication(3)
2x1=2
2x2=4
3x1=3
3x2=6
3x3=9

//  multiplication(5)
2x1=2
2x2=4
3x1=3
3x2=6
3x3=9
4x1=4
4x2=8
4x3=12
4x4=16
5x1=5
5x2=10
5x3=15
5x4=20
5x5=25

## 回報流程

1. 將答案貼在 Codepen 並複製 Codepen 連結貼至「回報區」回報
（也可以將答案直接貼至「回報區」）


<!-- 解答： -->

回報區
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for (i = 2; i < num; i++) {
for (j = 1; j < num; j++) {
return `${i}*${j}=${i * j}`;
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