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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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