Function - cruisechang/wiki-golang GitHub Wiki

Function as parameter

Function as return value

(A function returns function which is called factory function)

Closure function

閉包函數會保留其外部函數的區域變數。 當重複呼叫時，這個變數會一直保留使用。

    package main

    import "fmt"

    func main() {
        var f = Adder()
        fmt.Print(closureTest(1),",")
        fmt.Print(closureTest(10),",")
        fmt.Print(closureTest(100))
    }

    func closureTest() func(int) int {
        var x int
        return func(inner int) int {
            x += inner
            return x
        }
    }
//Result: 1，11，111