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reflect.Kind() Function in Golang with Examples

  • Last Updated : 28 Apr, 2020

Go language provides inbuilt support implementation of run-time reflection and allowing a program to manipulate objects with arbitrary types with the help of reflect package. The reflect.Kind() Function in Golang is used to find the name of kind. To access this function, one needs to imports the reflect package in the program.

Syntax:

func (k Kind) String() string

Parameters: This function does not takes any parameters.

Return Value: This function returns string (the name of kind).

Below examples illustrate the use of above method in Golang:



Example 1:




// Golang program to illustrate
// reflect.Kind() Function
  
package main
  
import (
    "fmt"
    "reflect"
)
  
type temp struct {
    ord int
    cId int
}
  
// function to use the
// Kind() method
func useKind(val interface{}) {
    s1 := reflect.TypeOf(val)
  
    // Kind() function is used
    // to find the kind
    s2 := s1.Kind()
    fmt.Println("Type ", s1)
    fmt.Println("Kind ", s2)
  
}
  
// Main function
func main() {
    val := temp{
        ord: 1,
        cId: 513,
    }
    useKind(val)
  
}

Output:

Type  main.temp
Kind  struct

Example 2:




// Golang program to illustrate
// reflect.Kind() Function
  
package main
  
import (
    "fmt"
    "reflect"
)
  
type temp struct {
    ord int
    cId int
}
  
// function to use the
// Kind() method
func useKind(val interface{}) {
  
    // Kind() function is used
    // to find the kind
    if reflect.ValueOf(val).Kind() == reflect.Struct {
        v := reflect.ValueOf(val)
        fmt.Println("Number of fields", v.NumField())
        for i := 0; i < v.NumField(); i++ {
            fmt.Printf("Field: %d \t type: %T \t value: %v\n",
                                    i, v.Field(i), v.Field(i))
        }
    }
  
}
  
// Main function
func main() {
    val := temp{
        ord: 1,
        cId: 513,
    }
    useKind(val)
  
}

Output:

Number of fields 2
Field: 0      type: reflect.Value      value: 1
Field: 1      type: reflect.Value      value: 513



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