Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to use Reflection in Golang?
Reflection in Golang is about getting to know the data types of the data that we are dealing with at runtime. There are often certain scenarios where we would want to know the data type of a certain variable that we are getting at runtime or something similar.
With the help of reflection, we can extract the type, values and kind of any data type in Golang.
In this article, we will explore different third-party functions that are used in reflection.
Example 1 – reflect.TypeOf()
It is used to return the value of type reflect. In simple words, it is used to know what is the data type.
Consider the code shown below where we will make use of this function.
package main
import (
"fmt"
"reflect"
)
func main() {
var name string = "TutorialsPoint"
fmt.Println(reflect.TypeOf(name))
sl := []int{1, 2, 3, 4, 5}
fmt.Println(reflect.TypeOf(sl))
num := 989
fmt.Println(reflect.TypeOf(num))
}Output
If we run the command go run main.go on the above command, we will get the following output in the terminal.
string []int int
Example 2 – reflect.ValueOf()
It is used when we want to find the value of the variable. Consider the code shown below where we will make use of this function.
package main
import (
"fmt"
"reflect"
)
func main() {
var name string = "TutorialsPoint"
fmt.Println(reflect.ValueOf(name))
sl := []int{1, 2, 3, 4, 5}
fmt.Println(reflect.ValueOf(sl))
num := 989
fmt.Println(reflect.ValueOf(num))
}Output
If we run the command go run main.go on the above command, we will get the following output in the terminal.
TutorialsPoint [1 2 3 4 5] 989
Example 3
We can also find the number of fields inside a struct. Consider the code shown below.
package main
import (
"fmt"
"reflect"
)
type Person struct {
age int
name string
number float64
isMarries bool
}
func main() {
p := Person{10, "ABCD", 15.20, true}
typeT := reflect.TypeOf(p)
fmt.Println(typeT.NumField())
}Output
If we run the command go run main.go on the above command, we will get the following output in the terminal.
4
486 Views
