In map Rules, the order in which the input values for a functional map are specified does not affect how many times the map is called, but it does affect the order in which the output objects appear.

在映射规则中，为功能性映射指定输入值的次序并不影响调用映射的次数，但是会影响输出对象出现的次序。

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The initialization of the "input" and "output" objects was omitted from the above sample code for a good reason: it's more complicated than the rest of the code.

在上面这个简单的例子中，我们将对“input”和“output”对象的初始化工作都省略了，原因在于：与其余代码相比，这些工作要更加复杂。

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