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headFirst/interfaces/gadget/tape.go

@@ -0,0 +1,27 @@
+package gadget
+
+import "fmt"
+
+type TapePlayer struct {
+	batteries string
+}
+
+func (t TapePlayer) Play(song string) {
+	fmt.Println("Playing", song)
+}
+
+func (t TapePlayer) Stop() {
+	fmt.Println("Stopped")
+}
+
+type TapeRecorder struct {
+	Microphones int
+}
+
+func (t TapeRecorder) Play(song string) {
+	fmt.Println("Playing", song)
+}
+
+func (t TapeRecorder) Stop() {
+	fmt.Println("Stopped")
+}

headFirst/interfaces/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.24.6

headFirst/interfaces/main.go

@@ -0,0 +1,26 @@
+package main
+
+import "main/gadget"
+
+type Player interface {
+	Play(string)
+	Stop()
+}
+
+func playlist(device Player, songs []string) {
+	for _, song := range songs {
+		device.Play(song)
+	}
+	device.Stop()
+}
+
+func main() {
+	var player Player
+	player = gadget.TapePlayer{}
+	mixtape := []string{"Red Plesen'", "Coco Jambo","Barbied Girl"}
+	playlist(player,mixtape)
+
+	player = gadget.TapeRecorder{}
+	mixtape = []string{"Dectl'", "Carmen","Scatman"}
+	playlist(player,mixtape)
+}