swift guard关键字详解及使用

swift guard关键字详解及使用

Swift提供guard关键字，guard关键字可以简化繁琐的判断逻辑

func buy( money: Int , price: Int , capacity: Int , volume: Int){

  if money >= price{
    if capacity >= volume{
      print("I can buy it!")
      print("\(money-price) Yuan left.")
      print("\(capacity-volume) cubic meters left")
    }
    else{
      print("No enough capacity")
    }
  }
  else{
    print("Not enough money")
  }
}

以上代码用guard关键字简化代码风格

func buy2( money: Int , price: Int , capacity: Int , volume: Int){

  guard money >= price else{
    print("Not enough money")
    return
  }

  guard capacity >= volume else{
    print("Not enough capacity")
    return
  }

  print("\(money-price) Yuan left.")
  print("\(capacity-volume) cubic meters left")
}

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