入门 Swift 第二章

折腾 › Swift
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Switch 挺好玩的 (bushi)

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let a = 10

switch(a) {
  case 5:
    print("5")
  case 10:
    print("10")
  case 15:
    print("15")
  default:
    print("IDK")
}

数组

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let array = ["温迪", "空", "派蒙"]

print(array, array[0], array[1])
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var array = ["温迪", "空", "派蒙"]

print(array, array[0], array[1], array[2])

array.append("安柏")

print(array, array[0], array[1], array[2], array[3])

空 (不是那个空)

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var num, num2: Int?

print(num, num2)

(num, num2) = (10, 10)

print(num, num2)

空合运算符

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var a: String? = "Apple"

print("\(a ?? "Microsoft")")

a = nil

print("\(a ?? "Microsoft")")
print("\(a ?? "Google")")