Golang如何使用迭代器模式_Golang 迭代器模式实践

type Iterator interface {
    Next() bool
    Value() interface{}
}

type IntSliceIterator struct {
    slice []int
    index int
}
<p>func (it *IntSliceIterator) Next() bool {
if it.index < len(it.slice) {
it.index++
return true
}
return false
}</p><p>func (it *IntSliceIterator) Value() interface{} {
return it.slice[it.index-1]
}</p>

slice := []int{1, 2, 3}
iter := &IntSliceIterator{slice: slice}
<p>for iter.Next() {
fmt.Println(iter.Value())
}</p>

func fibonacci() func() int {
    a, b := 0, 1
    return func() int {
        a, b = b, a+b
        return a
    }
}

next := fibonacci()
for i := 0; i < 10; i++ {
    fmt.Println(next())
}

func channelIterator(data []int) <-chan int {
    ch := make(chan int)
    go func() {
        for _, v := range data {
            ch <- v
        }
        close(ch)
    }()
    return ch
}

for v := range channelIterator([]int{1, 2, 3}) {
    fmt.Println(v)
}