Reflection is used in the Go language

This article illustrates the use of reflection in the Go language. Share with you for your reference. The specific implementation method is as follows:

// Data Model

type Dish struct {

  Id  int

  Name string

  Origin string

  Query func()

}

The creation example is as follows:

shabushabu = Dish.new

shabushabu.instance_variables # => []

shabushabu.name = "Shabu-Shabu"

shabushabu.instance_variables # => ["@name"]

shabushabu.origin = "Japan"

shabushabu.instance_variables # => ["@name", "@origin"]

The complete code is as follows:

package main

import(

  "fmt"

  "reflect"

)

 

func main(){

  // iterate through the attributes of a Data Model instance

  for name, mtype := range attributes(&Dish{}) {

    fmt.Printf("Name: %s, Type %s\n", name, mtype.Name())

  }

}

 

// Data Model

type Dish struct {

  Id  int

  Name string

  Origin string

  Query func()

}

 

// Example of how to use Go's reflection

// Print the attributes of a Data Model

func attributes(m interface{}) (map[string]reflect.Type) {

  typ := reflect.TypeOf(m)

  // if a pointer to a struct is passed, get the type of the dereferenced object

  if typ.Kind() == reflect.Ptr{

    typ = typ.Elem()

  }

 

  // create an attribute data structure as a map of types keyed by a string.

  attrs := make(map[string]reflect.Type)

  // Only structs are supported so return an empty result if the passed object

  // isn't a struct

  if typ.Kind() != reflect.Struct {

    fmt.Printf("%v type can't have attributes inspected\n", typ.Kind())

    return attrs

  }

 

  // loop through the struct's fields and set the map

  for i := 0; i < typ.NumField(); i++ {

    p := typ.Field(i)

      if !p.Anonymous {

        attrs[p.Name] = p.Type

      }

     }

  return attrs

}

I hope this article has been helpful to your programming of Go language.