Advanced functions

　　Advanced functions, or higher-order functions, have the following characteristics:

　　　　1. Parameters are functions

　　　　2. The return value is a function

　　As long as a function that satisfies one of the characteristics, it can be called a higher-order function;

 

 

 

 

https://www.cnblogs.com/laixiangran/p/5468567.html

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