reflect.New() Function in Golang with Examples
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) ValueParameters: 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 := "w3wiki" 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:
w3wiki Articles {A:20 B:Number}, 20, Number
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