cherry 的专栏

Class and structures are general-purpose 、flexible constructs that become the building blocks of your program’s code. 类和结构体是人们构造代码所用的一种通用且灵活的构造体。 Unlike other programming languages , Swift does req

You can  also  use an  implicity unwrapped optinal  with optional binding,to check and unwrap its value in a single  staement. 你也可以在可选绑定中使用一个隐式解析可选来检查并解析它的值。 An assesion also lets you provide a s

compound assignment operator 复合赋值操作符 preceding [英]prɪ'si:dɪŋ [美]prɪˈsidɪŋ adj. （时间或地点上）在先的，在前的，前面的;前述的;上述的 v. 在…之前发生（或出现）;走在…前面;先于;“precede”的现在分词 [例句]

1. Mutability of Collections 集合的可变性 2. For dictionaries, immutability  also mean that you cannot  replace the value for an existing  key in the dictionary . 对字典来说，不可变性也意味这我们不能替换其中任何现有键所对应的值。 3

Swift  also makes   extensive  user of  variables whose  values  cannot be changed. 在Swift中，值不可比变的变量有着广泛的应用。   Constants  are used throughout Swift  to make code safer  and clearer  in intent  when