How can i know the length of struct in golang?

November 29, 2021

I am new to Golang and I am trying to get a number of attributes from a structure
For example:

type Client struct{
    name string//1
    lastName string//2
    age uint//3
}
func main(){
    client := Client{name:"Facundo",lastName:"Veronelli",age:23}
    fmt.println(client.getLengthAttibutes())//It would print "3" 
}

>Solution :

Using the reflect package’s ValueOf() function returns a value struct. This has a method called NumFields that returns the number of fields.

import (
  "fmt"
  "reflect"
)

type Client struct{
    name string//1
    lastName string//2
    age uint//3
}

func main(){
    client := Client{name:"Facundo",lastName:"Veronelli",age:23}
    v := reflect.ValueOf(client)
    fmt.Printf("Struct has %d fields", v.NumField())
}