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January 17, 2021 14:06
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interfaces in go #go
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| DEFINING | |
| in interfaces we are definig behaviors | |
| func main() { | |
| var consoleWriter ConsoleWriter = ConsoleWriter{} | |
| consoleWriter.Write("siemanko!") | |
| } | |
| type Writer interface { | |
| Write(string) (int, error) | |
| } | |
| type ConsoleWriter struct{} | |
| func (cs ConsoleWriter) Write(input string) (int, error) { | |
| message, err := fmt.Println(input) | |
| return message, err | |
| } | |
| we can compose interfaces: | |
| type Writer interface{ | |
| Write([]byte) (int, error) | |
| } | |
| type Closer interface{ | |
| Close() error | |
| } | |
| typer WriterCloser interface{ | |
| Writer | |
| Closer | |
| } | |
| BEST PRACTISES | |
| -many, small interfaces not one big | |
| io.Writer | |
| io.Reader |
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