reflect.Interface() Function in Golang with Examples

Last Updated : 03 May, 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.Interface() Function in Golang is used to get the v’s current value as an interface{}. To access this function, one needs to imports the reflect package in the program.

Syntax:
func (v Value) Interface() (i interface{})
Parameters: This function accept only one parameter.

i : This parameter is the interface{} type

Return Value: This function returns v’s current value as an interface{}.

Below examples illustrate the use of the above method in Golang:

Example 1:

// Golang program to illustrate 
// reflect.Interface() Function  
   
package main 
   
import ( 
    "fmt"
    "reflect"
) 
   
// Main function  
func main() { 
    t := reflect.TypeOf(5) 
       
    //use of Interface method 
    arr := reflect.ArrayOf(4, t) 
    inst := reflect.New(arr).Interface().(*[4]int) 
   
    for i := 1; i <= 4; i++ { 
        inst[i-1] = i*i 
    } 
   
    fmt.Println(inst) 
} 

Output:

&[1 4 9 16]

Example 2:

// Golang program to illustrate 
// reflect.Interface() Function 
   
package main 
   
import ( 
    "fmt"
    "reflect"
) 
   
// Main function 
func main() { 
   
    var str []string 
    var v reflect.Value = reflect.ValueOf(&str) 
   
    v = v.Elem() 
   
   
    v = reflect.Append(v, reflect.ValueOf("a")) 
    v = reflect.Append(v, reflect.ValueOf("b")) 
    v = reflect.Append(v, reflect.ValueOf("c"), reflect.ValueOf("j, k, l")) 
   
    fmt.Println("Our value is a type of :", v.Kind()) 
   
    vSlice := v.Slice(0, v.Len()) 
    vSliceElems := vSlice.Interface() 
   
    fmt.Println("With the elements of : ", vSliceElems) 
   
} 

Output:

Our value is a type of : slice
With the elements of :  [a b c j, k, l]

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