34 lines
561 B
Go
34 lines
561 B
Go
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package main
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type Player interface {
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Play(string)
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Stop()
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}
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func TryOut(player Player) {
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player.Play("Test Track")
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player.Stop()
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recorder, ok := player.(TapeRecorder)
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if ok {
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recorder.Record()
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}
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}
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func playList(device Player, songs []string) {
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for _, song := range songs {
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device.Play(song)
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}
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device.Stop()
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}
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func main() {
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mixTape := []string{"Jessie's Girl", "Whip It", "9 to 5"}
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var player Player = TapePlayer{}
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playList(player, mixTape)
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player = TapeRecorder{}
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playList(player, mixTape)
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TryOut(TapeRecorder{})
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TryOut(TapePlayer{})
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}
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