Some Golang notes

golangnotes.go

/////////////////////////////////////////////////////////////////////////////// Inheritance
package main

import "fmt"


type Vehicle struct {
    wheelCount int 
}

// Define a behavior for Vehicle
func (vehicle Vehicle) numberOfWheels() int {
    return vehicle.wheelCount
}

type Bike struct {
    // Anonymous field Vehicle
    Vehicle
}

func main() {
    bike := Bike{ Vehicle{ 2 } }
     // No method defined for Bike, but we have the same behavior as Vehicle.
    fmt.Println("A Bike has this many wheels: ", bike.numberOfWheels())
}

/////////////////////////////////////////////////////////////////////////////// Constructor

package main

import "fmt"

type Rectangle struct {
    Name          string
    Width, Height float64
}

func main() {
    var a Rectangle
    var b = Rectangle{"I'm b.", 10, 20}
    var c = Rectangle{Height: 12, Width: 14}

    fmt.Println(a)
    fmt.Println(b)
    fmt.Println(c)
}

/////////////////////////////////////////////////////////////////////////////// Interface
package main

import (
    "fmt"
)

type Animal interface {
    Speak() string
}

type Dog struct {
}

func (d Dog) Speak() string {
    return "Woof!"
}

type Cat struct {
}

func (c Cat) Speak() string {
    return "Meow!"
}

type Llama struct {
}

func (l Llama) Speak() string {
    return "LaLLamaQueLLama!"
}


func main() {
    animals := []Animal{Dog{}, Cat{}, Llama{}}
    for _, animal := range animals {
        fmt.Println(animal.Speak())
    }
}