LUA Functional Programming Demo

What is functional programming

Http://www.zhihu.com/topic/19585411/hot

The nature of functional programming
Functions in functional programming the term does not refer to a function in a computer (actually a subroutine), but rather to a function in mathematics, the mapping of an independent variable. This means that the value of a function is determined only by the value of the function parameter, not by other states. For example, the sqrt (x) function calculates the square root of X, as long as x is not changed, and whenever the call is called, the value is constant.
In a functional language, a function can be defined anywhere, within a function or function, as a function's parameter and return value, and can be combined with a function.
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Links: http://www.zhihu.com/question/28292740/answer/40336090
Source: Know
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Example

function Makeenscapehandler (func, preprocess)

return function (num)

num = preprocess (num)

Func (NUM)

End

End

Local function plusonefunc (num)

Return num+1

End

Local Printplusone = Makeenscapehandler (print, Plusonefunc)

Printplusone (1)

LUA Functional Programming Demo