如何在Go语言中检查变量类型是否为map

map1 := map[string]string{"name":"John","desc":"Golang"}
map2 := map[string]int{"apple":23,"tomato":13}

so,How to check variable type is map in Go language？

You can use the reflect.ValueOf() function to get the Value of those maps, and then get the Kind from the Value, which has a Map entry (reflect.Map).

http://play.golang.org/p/5AUKxECqNA

http://golang.org/pkg/reflect/#Kind

Here's a more specific example that does the comparison with reflect.Map: http://play.golang.org/p/-qr2l_6TDq

package main

import (
   "fmt"
   "reflect"
)

func main() {
   map1 := map[string]string{"name": "John", "desc": "Golang"}
   map2 := map[string]int{"apple": 23, "tomato": 13}
   slice1 := []int{1,2,3}
   fmt.Printf("%v is a map? %v
", map1, reflect.ValueOf(map1).Kind() == reflect.Map)
   fmt.Printf("%v is a map? %v
", map2, reflect.ValueOf(map2).Kind() == reflect.Map)
   fmt.Printf("%v is a map? %v
", slice1, reflect.ValueOf(slice1).Kind() == reflect.Map)
}

prints:

map[name:John desc:Golang] is a map? true
map[apple:23 tomato:13] is a map? true
[1 2 3] is a map? false

If you want to know the more specific map type, you can use reflect.TypeOf():

http://play.golang.org/p/mhjAAdgrG4

You can use fmt and avoid using reflection.

func isMap(x interface{}) bool {
    t := fmt.Sprintf("%T", x)
    return strings.HasPrefix(t, "map[")
}

map1 := map[string]string{"name": "John", "desc": "Golang"}
fmt.Printf("map1 is a map? %t", isMap(map1))

Produces:

map1 is a map? true

https://play.golang.org/p/OVm-_jgz33r

Reflection is discouraged in Go. To quote Rob Pike, "Clear is better than clever" and "Reflection is never clear."