Swift提供guard關鍵字，guard關鍵字可以簡化繁瑣的判斷邏輯
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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") }} |
以上代碼用guard關鍵字簡化代碼風格
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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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原文鏈接：http://blog.csdn.net/u012903898/article/details/52834391
