Lesson 2: More Fields - Structs and Methods

More Fields Give the struct several fields.

1package main

3import "fmt"

5type Dog struct {

6 name string

7 age int

10func main() {

11 rex := Dog{name: "Rex", age: 3}

12 fmt.Println(rex.name, "is", rex.age)

13}

Terminal

$ go run main.go

Rex is 3

Every line, explained

package main: Every Go file starts by saying which package it belongs to, exactly as in Intro to Go.
import "fmt": import "fmt" brings in the printing tools, as always.
type Dog struct {: type Dog struct { ... } defines a struct: a bundle of fields that belong together. Go has no classes; structs are how Go groups data, and they do the job beautifully.
name string: Every Dog has a name...
age int: ...and an age. A struct can bundle as many fields as you need, of any types.
}: This } closes the struct definition.
func main() {: func main() { ... } is where the program starts.
rex := Dog{name: "Rex", age: 3}: Fills in both fields at once, separated by a comma.
fmt.Println(rex.name, "is", rex.age): fmt.Println(...) prints to the terminal, exactly as in Intro to Go. Println with commas prints the pieces with spaces between them: Rex is 3.
}: This } closes func main.