Interface Article - PowerLevel.go

powerlevel.go

package main

import (
        "fmt"
)

type Database interface {
        Fetch(key string) (int, error)
}

var DB Database

func isOver9000() bool {
        i, err := DB.Fetch("powerlevel")
        if err != nil {
                // if this were a real program, this should return an error
                // but this is an example, so it's ok.
                return false
        }

        if i > 9000 {
                return true
        }

        return false
}

func main() {
        if isOver9000() {
                fmt.Println("It's over 9000!!!")
        }
}