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How to print the structure's fields with their names in Golang

Shubham Singh Kshatriya

Overview

In Golang, we can print the structure’s fields with their names using the following:

  • Marshal() function of encoding/json package.
  • Printf() function of fmt package

The Marshal() function

Syntax

byteArr, _ := json.Marshal(structure)
Syntax of Marshal() function

Example

package main

// importing necessary packages
import (
    "fmt"
    "encoding/json"
)

// structure whose fields are to be printed
type structure struct {
    Country string
    Capital string
}

func main() {
    // initializing structure
    var s = structure {
        Country: "India",
        Capital: "New Delhi",
    }

    // marshalling the structure
    byteArr, _ := json.Marshal(s)

    // typecasting byte array to string
    // and printing on console
    fmt.Println(string(byteArr))
}
Example of Marshal() function

Explanation

  • Line 4–8: We import the necessary packages.
  • Line 10–13: We create a structure.
  • Line 18–20: We initialize the structure.
  • Line 23: We marshal the structure.
  • Line 27: We typecast the byte array into a string and print it on the console.

Output

The Marshal function will return a byte array. After typecasting it to string, we can see the fields of the structure along with their names on the console.

The Printf() function

We can use the formatted I/O feature of the Printf() function to print the structure's fields along with their names using the %+v argument.

Example

package main

// importing necessary packages
import (
    "fmt"
)

// structure whose fields are to be printed
type structure struct {
    Country string
    Capital string
}

func main() {
    // initializing structure
    var s = structure {
        Country: "India",
        Capital: "New Delhi",
    }

    // printing the structure on console
    fmt.Printf("%+v", s)
}
Example of Printf() function

Explanation

  • Line 4–6: We import the necessary packages.
  • Line 9–12: We create a structure.
  • Line 16–19: We initialize the structure.
  • Line 22: We print the structure on the console.

Output

In the output, we can see the fields of the structure along with their names.

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golang
communitycreator

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Shubham Singh Kshatriya
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