swift語言的特點（相對於oc）
阿新 • • 發佈：2018-12-12
1、泛型、泛型約束與擴充套件；
2、函數語言程式設計；
3、值型別、引用型別；
4、列舉、關聯值、元組等其他
上述為swift最大的特點
Another safety feature is that by default Swift objects can never be nil, and trying to make or use a nil object will results in a compile-time error.
Swift is a type-safe language, which means the language helps you to be clear about the types of values your code can work with. If part of your code requires a String
Int by mistake. Likewise, type safety prevents you from accidentally passing an optional String to a piece of code that requires a nonoptional String. Type safety helps you catch and fix errors as early as possible in the development process.