畫星星蘋果多邊形 — nested loop(巢狀迴圈) 範例參考

畫直角三角形1

var content = ""
let count = 5
for i in 1...count {
    for _ in 1...i {
        content += "🐈"
    }
    content += "\n"
}

畫直角三角形2

var content = ""
let count = 5
for i in 1...count {
    for _ in i...count {
        content += "🐈"
    }
    content += "\n"
}

畫直角三角形3

var content = ""
let count = 5
for i in 1...count {
    for j in 1...count {
        if i > j {
            content += "🦉"
        } else {
            content += "🐈"
        }
    }
    content += "\n"
}

畫金字塔

var content = ""
let count = 5
for i in 1...count {
    for _ in i..<count {
        content += "🦉"
    }
    let number = i * 2 - 1
    for _ in 1...number {
        content += "🐈"
    }
    content += "\n"
}

畫三角形

var content = ""
let count = 5
var catCount = 1
for i in 1...count*2-1 {
    for _ in 1...catCount {
        content += "🐈"
    }
    if i < count {
        catCount += 1
    } else {
       catCount -= 1
    }
   
    content += "\n"
}

畫菱形

var content = ""
let count = 5
var birdCount = count - 1
var catCount = 1
for i in 1...count*2-1 {
    for _ in 0..<birdCount {
        content += "🦉"
    }
    for _ in 1...catCount {
        content += "🐈"
    }
    if i < count {
        birdCount -= 1
        catCount += 2
    } else {
        birdCount += 1
        catCount -= 2
    }
   
    content += "\n"
}

每排顯示不同圖案

搭配 array。

let roles = ["🧛‍♀️", "👻", "🎅", "🧙‍♀️", "🦸‍♀️"]
var content = ""
for i in 0..<roles.count {
    let role = roles[i]
    for _ in 0...i {
        content += role
    }
    content += "\n"
}

var content = ""
let count = 5
let animals = ["🐈", "🦮", "🐇", "🐒", "🐄"]
var appleCount = count - 1
var animalCount = 1
for i in 1...count*2-1 {
    for _ in 0..<appleCount {
        content += "🍎"
    }
    let number = (animalCount-1) / 2
    for j in 0...number {
        content += animals[j]
    }
    for j in 0..<number {
        content += animals[number-1-j]
    }
    if i < count {
        appleCount -= 1
        animalCount += 2
    } else {
        appleCount += 1
        animalCount -= 2
    }
    content += "\n"
}