A data type specifies the type of value that a variable, constant, or function can accept.

资料型别会指定变数、常数或函式可接受之值的类型。

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Using type annotation for function parameters helps ensure that a function will accept only data that it can process.

为函式参数使用型别附注，可帮助确保函式只接受它能处理的资料。

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Using type annotation for function parameters helps ensure that a function will accept only data that it can process.

为函式参数使用型别附注，可帮助确保函式只接受它能处理的资料。

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