您如何确定变量是切片还是数组？

问题描述：

I have a function that is passed a map, each element of which needs to be handled differently depending on whether it is a primitive or a slice. The type of the slice is not known ahead of time. How can I determine which elements are slices (or arrays) and which are not?

我有一个传递给映射的函数，根据其是否需要对每个元素进行不同的处理原语或切片。切片的类型事先未知。如何确定哪些元素是切片（或数组）而哪些不是切片？ p> div>

答

Have a look at the reflect package. Here is a working sample for you to play with.

package main

import "fmt"
import "reflect"

func main() {
    m := make(map[string]interface{})
    m["a"] = []string{"a", "b", "c"}
    m["b"] = [4]int{1, 2, 3, 4}

    test(m)
}

func test(m map[string]interface{}) {
    for k, v := range m {
        rt := reflect.TypeOf(v)
        switch rt.Kind() {
        case reflect.Slice:
            fmt.Println(k, "is a slice with element type", rt.Elem())
        case reflect.Array:
            fmt.Println(k, "is an array with element type", rt.Elem())
        default:
            fmt.Println(k, "is something else entirely")
        }
    }
}

您如何确定变量是切片还是数组？

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