Golang : Clone with pointer and modify value



Tags : golang pointer clone

For those familiar with C language and learning Golang, bear in mind that Golang supports pointer. In this short tutorial, we will learn how to create a struct tied to pointer, how to clone and manipulated the struct data with the pointer(second := *first ).

The code example below should be self explanatory. Should you have any question, please leave a comment below.

 package main

 import (
  "fmt"
 )

 type User struct {
  Id int
  Name string
 }

 func createUser() *User {
  newUser := new(User)
  newUser.Id = 1
  newUser.Name = "Adam"
  return newUser
 }

 func main() {
  // create our first user
  first := createUser()

  fmt.Printf("first user id is %d and name is %s\n", first.Id, first.Name)

  // clone first user to second user
  second := *first

  // data are cloned as well
  fmt.Printf("second user id is %d and name is %s\n", second.Id, second.Name)

  // now modify second user's name and id
  second.Id = 2
  second.Name = "Victoria"

  fmt.Printf("[modified] second user id is %d and name is %s\n", second.Id, second.Name)

 }

Output :

first user id is 1 and name is Adam

second user id is 1 and name is Adam

[modified] second user id is 2 and name is Victoria



Tags : golang pointer clone

By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


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