reflect.New() 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.New() Function in Golang is used to get the Value representing a pointer to a new zero value for the specified type. To access this function, one needs to imports the reflect package in the program.

Syntax:
  func New(typ Type) Value  
Parameters: This function takes the following parameters:

typ : This parameter is the Type.

Return Value: This function returns a Value representing a pointer to a new zero value for the specified type.

Below examples illustrate the use of above method in Golang : Example 1:

// Golang program to illustrate // reflect.New() Function    package main   import (     "fmt"     "reflect" )   // Main function  func main() {     t := reflect.TypeOf(5)           //use of ArrayOf 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.New() Function    package main   import (     "fmt"     "reflect" )    type Geek struct {     A int `tag1:"First Tag" tag2:"Second Tag"`     B string }  // Main function func main() {     greeting := "GeeksforGeeks"     f := Geek{A: 10, B: "Number"}      gVal := reflect.ValueOf(greeting)      fmt.Println(gVal.Interface())      gpVal := reflect.ValueOf(&greeting)     gpVal.Elem().SetString("Articles")     fmt.Println(greeting)      fType := reflect.TypeOf(f)     fVal := reflect.New(fType)     fVal.Elem().Field(0).SetInt(20)     fVal.Elem().Field(1).SetString("Number")     f2 := fVal.Elem().Interface().(Geek)     fmt.Printf("%+v, %d, %s\n", f2, f2.A, f2.B) }

Output:

  GeeksforGeeks  Articles  {A:20 B:Number}, 20, Number

reflect.New() Function in Golang with Examples

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reflect.New() Function in Golang with Examples

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