closure function

[zhongqin0820]

need more practicing and understanding

[zhongqin0820]

函数名其实就是指向一个函数对象的引用，完全可以把函数名赋给一个变量，相当于给这个函数起了一个“别名”

[zhongqin0820]

在go指南基础练习中的闭包return是否可以看成是一种尾递归？

[zhongqin0820]

在闭包调用中， 调用的指向是返回部分的内容！而不是Fibonacci()，只包括return部分的匿名函数内容。
如果下一次又将Fibonacci()赋值给一个函数变量，则又一次初始化i与j。否则每次调用f()时并不会每次都初始化，而只是调用上一次的i,j

[zhongqin0820]

A closure is a persistent local variable scope

A closure is a persistent scope which holds on to local variables even after the code execution has moved out of that block. Languages which support closure (such as JavaScript, Swift and Ruby) will allow you to keep a reference to a scope (including its parent scopes), even after the block in which those variables were declared has finished executing, provided you keep a reference to that block or function somewhere.

The scope object, and all its local variables, are tied to the function, and will persist as long as that function persists.

This gives us function portability. We can expect any variables that were in scope when the function was first defined to still be in scope when we later call the function, even if we call the function in a completely different context.

[zhongqin0820]

参考此文简单易懂