Swift提供guard关键字，guard关键字可以简化繁琐的判断逻辑
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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")
}
}
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以上代码用guard关键字简化代码风格
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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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原文链接：http://blog.csdn.net/u012903898/article/details/52834391