Printing nested fields on Go objects-CodePudding

I'm trying to understand from the below code, how can I print only "species" and "width" key values.

package main

import (
    "encoding/json"
    "fmt"
)

type Dimensions struct {
    Height int
    Width  int
}

type Bird struct {
    Species     string
    Description string
    Dimensions  Dimensions
}

func main() {
    birdJson := `{"species":"pigeon","description":"likes to perch on rocks", "dimensions":{"height":24,"width":10}}`
    var bird Bird
    json.Unmarshal([]byte(birdJson), &bird)
    fmt.Println(bird)
    // {pigeon likes to perch on rocks {24 10}}
}

The output I'm expecting is: pigeon and 10

CodePudding user response：

What you're doing here is printing the entire object when you should be printing the specific fields you're looking for. Instead, you should try this:

fmt.Println(bird.Species, bird.Dimensions.Width)

which will yield:

pigeon 10

To make this a bit more readable, you can use fmt.Printf like so:

fmt.Printf("Species: %s, Width: %d\n", bird.Species, bird.Dimensions.Width)

which will yeild:

Species: pigeon, Width: 10

CodePudding user response：

You can put a json tag on the structure that does not need to be printed, like this json: "-"