Go Structs and Methods

ExampleGo

package main

import "fmt"

type Person struct {
  Name string
  Age  int
}

func (p Person) Describe() string {
  return fmt.Sprintf("%s is %d", p.Name, p.Age)
}

func (p *Person) Birthday() {
  p.Age++
}

func main() {
  p := Person{Name: "Ada", Age: 36}
  p.Birthday()
  fmt.Println(p.Describe())
  fmt.Printf("%+v\n", p)
}

Output

Ada is 37
{Name:Ada Age:37}

A method is a function attached to a type. A pointer receiver (*Person) lets the method change the original value.

Quick check

Why does Birthday use a *Person receiver?

To change the original PersonTo make it faster to typeGo requires pointers for methods

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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