范围构造与Go中的闭包有何关系？ [关闭]

Question

Is there any relation between for-range and closures in Go? I think that for-range can be thought of as using a closure.

Answer 1

A possible answer could be this code that has the same behavior. Firstly, I use a closure and secondly, I use a for-range loop.

package main

import "fmt"

func main() {

    names := [4]string{"John", "Marie", "David", "Alex"}

    iter := generator(names)
    for true {
        i, v := iter()
        fmt.Printf("%v %s
", i, v)

        if i == 3 {
            break
        }
    }

    fmt.Println("---------------------------------")

    for i, v := range names {
        fmt.Printf("%v %s
", i, v)
    }
}

func generator(arr [4]string) func() (int, string) {

    index := 0

    return func() (int, string) {

        nextName := arr[index]
        index++
        return index - 1, nextName
    }
}