Golang : Convert string slice to struct and access with reflect example



Tags : golang reflect slice-to-struct

Writing this down here for my own future references. Basically, what this code does is to convert a given string data slice into struct. Pretty handy to have when processing data output from proprietary systems.

Here you go!


 package main

 import (
 "fmt"
 "log"
 "reflect"
 "strconv"
 )

 type User struct {
 Id int
 Username string
 }

 func main() {

 data := [][]string{
 []string{"1", "Adam"},
 []string{"2", "Eve"},
 }

 // convert data string slice to struct
 // such as
 //user1 := &User{"1","Adam"}
 //user2 := &User{"2","Eve"}

 users := []*User{}

 for _, v := range data {
 //fmt.Println("data: ", v[0], v[1])

 // convert v[0] to type integer
 id, err := strconv.Atoi(v[0])
 if err != nil {
 log.Fatal(err, v[0])
 }
 user := &User{id, v[1]}
 users = append(users, user)
 }

 // the reflect way
 for i := 0; i < 2; i++ {
 u := reflect.ValueOf(users[i])
 id := reflect.Indirect(u).FieldByName("Id")
 name := reflect.Indirect(u).FieldByName("Username")

 fmt.Println(id, name)
 fmt.Println("==========")
 }

 }

Output:

1 Adam

==========

2 Eve

==========

Happy coding!

Reference:

https://www.socketloop.com/tutorials/golang-how-to-get-struct-field-and-value-by-name

  See also : Golang : How to get struct field and value by name



Tags : golang reflect slice-to-struct

By Adam Ng

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