package main

import (
	"fmt"
	"strings"
)

//闭包
func adder(x int) func(int) int {
	return func(y int) int {
		x += y
		return x
	}
}

func suffixFunc(suffix string) func(string) string {
	return func(name string) string {
		if !strings.HasSuffix(name, suffix) {
			return name + suffix
		}
		return name
	}
}

func cal(base int) (func(int) int, func(int) int) {
	add := func(i int) int {
		base += i
		return base
	}

	sub := func(i int) int {
		base -= i
		return base
	}
	return add, sub
}

func main() {
	a, b := cal(10)
	fmt.Println(a(20), b(30))
	fmt.Println(a(100), b(80))

	//jpgFunc := suffixFunc(".jpg")
	//res := jpgFunc("test.jpg")
	//fmt.Println(res)

	//a := adder(10)
	//fmt.Println(a(20))
	//fmt.Println(a(40))
	//
	//b := adder(20)
	//fmt.Println(b(40))
}