golang学习 函数

// func
package main

import (
	"fmt"
)

func main() {
	fmt.Println("Hello World!")

	value, nextPos := nextInt(1, 2)

	fmt.Println(value, nextPos)

	// 延迟执行
	for i := 0; i < 5; i = i + 1 {

		defer fmt.Println("defer i -> ", i)
	}

	// 函数作为数值
	a := func(a int, b int) int {
		return (a + b)
	}

	fmt.Println(a(6, 7))

	fmt.Printf("%Tn", a)

	//回调
	callback := func(n int, f func(int, int) int) int {

		return f(n, n) * f(n, n)
	}

	fmt.Printf("callback -> %d", callback(2, a))

	// panic & recover

	pf := func() {

		//panic(1)
	}

	fmt.Println(throwPanic(pf))
}

// 命名返回值
func nextInt(n int, k int) (value, nextPos int) {

	value = 0
	nextPos = 9

	return
}

// 可变参数
func output(args ...int) {

}

// panic & recover
func throwPanic(f func()) (b bool) {

	defer func() {

		if x := recover(); x != nil {

			b = true
		}
	}()

	f()

	return
}