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:
package main
import (
"fmt"
"reflect"
)
func main() {
t := reflect.TypeOf(5)
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:
package main
import (
"fmt"
"reflect"
)
type Geek struct {
A int `tag1: "First Tag" tag2: "Second Tag" `
B string
}
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
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...