Using the most appropriate type for variables is very important, as it can reduce code and data size and increase performance considerably.

为变量定义最恰当的类型，非常重要，因为这样可以减少代码和数据的长度，可以非常显著的提高效率。

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When your code runs, you can examine the characteristics of the file, such as its name, size, and MIME type, and you can then save it.

当您的程序码执行时，可以检查档案的特性，例如名称、大小和MIME类型，接著您就可以储存它。

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All three of these negatively impact code size, and exceptions and runtime type identification also increase execution time.

这三个特性都对代码的大小有负面的影响，而且异常事件和运行时类型识别还会增加执行时间。

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