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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