65 lines
1.1 KiB
Go
65 lines
1.1 KiB
Go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"fmt"
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"math/rand"
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"time"
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)
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// Socket has the power!
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type Socket struct {
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power int
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}
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// Plug a device to draw power from the `Socket`
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func (s *Socket) Plug(device PowerDrawer) {
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n := rand.Intn(50)
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s.power -= n
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device.Draw(n)
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}
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// PowerDrawer can be any type that can be powered
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type PowerDrawer interface {
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Draw(power int)
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}
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// -----
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// Kettle can be powered
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type Kettle struct{}
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// Draw power to a Kettle
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func (Kettle) Draw(power int) {
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fmt.Printf("Kettle is drawing %dkW of electrical power.\n", power)
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}
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// Mixer can be powered
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type Mixer struct{}
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// Draw power to a Mixer
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func (Mixer) Draw(power int) {
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fmt.Printf("Mixer is drawing %dkW of electrical power.\n", power)
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}
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// -----
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func main() {
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rand.Seed(time.Now().UnixNano())
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kettle := Kettle{}
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mixer := Mixer{}
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socket := &Socket{100}
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socket.Plug(kettle)
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socket.Plug(mixer)
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fmt.Printf("Socket's available power is %d kW.\n", socket.power)
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}
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