golang iterate via structure fields

To iterate through the fields of a structure in Go (golang), you can make use of the reflect package. Here are the steps to achieve this:

1. First, import the reflect package at the beginning of your Go file by including the following line of code:

import "reflect"

1. Next, define your structure with the desired fields. For example, let's say we have a structure called "Person" with fields "Name" and "Age":

type Person struct {
    Name string
    Age  int
}

1. Create an instance of the structure and populate it with some values:

person := Person{Name: "John", Age: 30}

1. Use the reflect package to obtain the value of the structure. Here's an example:

val := reflect.ValueOf(person)

1. Now, you can use the NumField() method of the reflect.Value object to determine the number of fields in the structure:

numFields := val.NumField()

1. To iterate through the fields, you can use a for loop. Here's an example:

for i := 0; i < numFields; i++ {
    field := val.Field(i)
    fmt.Println(field.Interface())
}

In the above example, we obtain each field using the Field() method of the reflect.Value object, and then we print its value using the Interface() method.

Note that the above code assumes that you have imported the "fmt" package to use the Println() function for printing the field values. If you haven't imported it yet, you can include the following line at the beginning of your Go file:

import "fmt"

That's it! You have successfully iterated through the fields of a structure in Go using the reflect package.