如何在Golang中实现迭代器模式遍历数据集合_Golang迭代器模式数据集合遍历方法汇总

type Iterator interface {
    Next() bool
    Value() interface{}
}
<p>type SliceIterator struct {
slice []interface{}
index int
}</p><p>func (it *SliceIterator) Next() bool {
it.index++
return it.index < len(it.slice)
}</p><p>func (it *SliceIterator) Value() interface{} {
if it.index >= 0 && it.index < len(it.slice) {
return it.slice[it.index]
}
return nil
}

type IntSlice struct {
    data []int
}
<p>func (s <em>IntSlice) Iterator() </em>IntSliceIterator {
return &IntSliceIterator{data: s.data, index: -1}
}</p><p>type IntSliceIterator struct {
data  []int
index int
}</p><p>func (it *IntSliceIterator) Next() bool {
it.index++
return it.index < len(it.data)
}</p><p>func (it *IntSliceIterator) Value() int {
return it.data[it.index]
}

func IntRange(from, to int) func() (int, bool) {
    i := from - 1
    return func() (int, bool) {
        i++
        return i, i <= to
    }
}

next := IntRange(1, 3)
for val, ok := next(); ok; val, ok = next() {
    fmt.Println(val)
}

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

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