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reflect.Append() 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.Append() Function in Golang is used to append appends the values x to a slice s. To access this function, one needs to imports the reflect package in the program.

Syntax:

func Append(s Value, x ...Value) Value

Parameters: This function takes the following parameters:

  • s: This parameter is the slice where values are to be append.
  • x: These parameter are values to be append.

Return Value: This function returns the resulting slice.

Below examples illustrate the use of above method in Golang:



Example 1:




// Golang program to illustrate
// reflect.Append() Function
  
package main
  
import (
    "fmt"
    "reflect"
)
  
// Main function
func main() {
  
    a := []int{2, 5}
      
    var b reflect.Value = reflect.ValueOf(&a)
  
    b = b.Elem()
      
    fmt.Println("Slice :", a)
      
    // use of Append method
  
    b = reflect.Append(b, reflect.ValueOf(80))
    fmt.Println("Slice after appending data:", b)
  
}

Output:

Slice : [2 5]
Slice after appending data: [2 5 80]

Example 2:




// Golang program to illustrate
// reflect.Append() Function
  
package main
  
import (
    "fmt"
    "reflect"
)
  
// Main function
func main() {
  
    var str []string
     var v reflect.Value = reflect.ValueOf(&str)
  
     v = v.Elem()
  
     // using the function
     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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