how to modify struct fields in golang [duplicate]

Question

I have example play.golang.org/p/Y1KX-t5Sj9 where I define method Modify() on struct User

type User struct {
  Name string
  Age int
}
func (u *User) Modify() {
  *u = User{Name: "Paul"}
}

in the main() I am defining struct literal &User{Name: "Leto", Age: 11} then call u.Modify(). That results in printing 'Paul 0' I like that struct field Name is changed , but what is the correct way to keep Age field ?

Adrian · Accepted Answer · 2020-09-14 21:04:10Z

67

Just modify the field you want to change:

func (u *User) Modify() {
  u.Name = "Paul"
}

This is covered well in the Go tour which you should definitely read through, it doesn't take long.

edited Sep 14, 2020 at 21:04

answered Nov 17, 2017 at 18:40

Adrian

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1 Comment

rhughes Over a year ago

Just as a comment to help others if needed - make sure that your signature definition is a pointer: func (u *User) Modify(), not simply as a value: func (u User) Modify() - This caught me out.

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