Golang如何实现迭代器模式与过滤器结合_Golang 迭代器模式应用技巧

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

func IntGenerator(start, end int) <-chan int {
    ch := make(chan int)
    go func() {
        defer close(ch)
        for i := start; i <= end; i++ {
            ch <- i
        }
    }()
    return ch
}

func Filter(src <-chan int, predicate func(int) bool) <-chan int {
    ch := make(chan int)
    go func() {
        defer close(ch)
        for val := range src {
            if predicate(val) {
                ch <- val
            }
        }
    }()
    return ch
}

nums := IntGenerator(1, 10)
evens := Filter(nums, func(n int) bool { return n%2 == 0 })
for even := range evens {
    fmt.Println(even)
}