Go面试必考题目之defer篇

下面程序分别输出什么?

func f1() {
    for i := 0; i < 5; i++ {
	defer fmt.Println(i)
    }
}

func f2() {
    for i := 0; i < 5; i++ {
	defer func() {
	    fmt.Println(i)
	}()
    }
}

func f3() {
    for i := 0; i < 5; i++ {
	defer func(n int) {
	    fmt.Println(n)
	}(i)
    }
}

func f4() int {
    t := 5
    defer func() {
	t++
    }()
    return t
}

func f5() (r int) {
    defer func() {
	r++
    }()
    return 0
}

func f6() (r int) {
    t := 5
    defer func() {
	t = t + 5
    }()
    return t
}

func f7() (r int) {
    defer func(r int) {
	r = r + 5
    }(r)
    return 1
}
复制代码

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转载于:https://juejin.im/post/5cd98568e51d453b4402370f